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OK, a few issue.
The 2nd gen xB and the bB share absolutely no parts. They are not the same vehicle. The xB is called a Toyota Corolla Rumion in Japan.
There is no frame on an xB, it is a unibody vehicle. I figure you know this but switching to the Matrix underpinnings would be a massive undertaking as you can bet that nothing would line up and you would have to fabricate most of the swap.
Now as for parts from the Matrix you can use, I would take the trans and rear driveshaft assembly as they will bolt up to your engine fine since both the Matrix AWD and xB run the 2AZ-FE engine. I wouldn't bother with the engine except as a spare to build up if you want to boost later on.
As for the rear suspension and underpinnings I would spend the money to get the driveshaft tunnel, rear floor pan, and rear suspension and axles from a JDM Rumion shipped over. Yes, it'll be expensive but probably about the same , or maybe even less than trying to fabricate the Matrix parts into a car they weren't designed for. Basically doing a "body swap" with the parts that will actually line up correctly and ease the fabrication substantially. You don't need to have the whole car shipped over as you don't need the engine or any of the other body parts so it'll cost less than bring over a whole vehicle. If you check on some of the FB xB pages there are guys who can help you get these shipped over as they bring shipping containers of parts over.
Oh yeah, you'll probably want to have the interior carpet shipped over as well since the floor pan will be different. The rear seats bolt in the same on all versions of the xB/Rumion from what I remember so you won't need that.
Here's a link to a Japanese online parts site I use that really helps in seeing the stock parts, http://auto-kat.com/index.php?route=saleepc/toyota/groups®ion=JAP&modification=138745
Use it against a USDM site to see what the differences are between the vehicles so you know exactly what you need. I would also compare the Matrix parts pages against the xB just to see how different they are. I may be wrong and they might be an easy fit since they are built from the same base platform, but I wouldn't count on it.
Oh and one other thing to keep in mind. Only the Matrix XRS has the same wheel bolt pattern as the xB, 5x114.3. So if this donor is not an XRS, which I don't think had AWD, then it has a 5x100 bolt pattern for the rear wheels so you would need to do a hub conversion as well. While the Rumion does have a 5x114.3 bolt pattern.
If you are game to do it I say go for it. Just take your time to plan everything out thoroughly, because no matter how much work you think it will be it'll end up being at least 50% more. lol
PS, for larger brakes you can swap the front rotors and caliper from a 2011-up tC right onto the 2nd gen xB. You get slightly larger pads and the rotors are thicker and .75" larger in diameter. I did the swap on mine a few years ago and it works great. You can usually find take off calipers on eBay or at your local wrecking yard for $100 or so.
The 2nd gen xB and the bB share absolutely no parts. They are not the same vehicle. The xB is called a Toyota Corolla Rumion in Japan.
There is no frame on an xB, it is a unibody vehicle. I figure you know this but switching to the Matrix underpinnings would be a massive undertaking as you can bet that nothing would line up and you would have to fabricate most of the swap.
Now as for parts from the Matrix you can use, I would take the trans and rear driveshaft assembly as they will bolt up to your engine fine since both the Matrix AWD and xB run the 2AZ-FE engine. I wouldn't bother with the engine except as a spare to build up if you want to boost later on.
As for the rear suspension and underpinnings I would spend the money to get the driveshaft tunnel, rear floor pan, and rear suspension and axles from a JDM Rumion shipped over. Yes, it'll be expensive but probably about the same , or maybe even less than trying to fabricate the Matrix parts into a car they weren't designed for. Basically doing a "body swap" with the parts that will actually line up correctly and ease the fabrication substantially. You don't need to have the whole car shipped over as you don't need the engine or any of the other body parts so it'll cost less than bring over a whole vehicle. If you check on some of the FB xB pages there are guys who can help you get these shipped over as they bring shipping containers of parts over.
Oh yeah, you'll probably want to have the interior carpet shipped over as well since the floor pan will be different. The rear seats bolt in the same on all versions of the xB/Rumion from what I remember so you won't need that.
Here's a link to a Japanese online parts site I use that really helps in seeing the stock parts, http://auto-kat.com/index.php?route=saleepc/toyota/groups®ion=JAP&modification=138745
Use it against a USDM site to see what the differences are between the vehicles so you know exactly what you need. I would also compare the Matrix parts pages against the xB just to see how different they are. I may be wrong and they might be an easy fit since they are built from the same base platform, but I wouldn't count on it.
Oh and one other thing to keep in mind. Only the Matrix XRS has the same wheel bolt pattern as the xB, 5x114.3. So if this donor is not an XRS, which I don't think had AWD, then it has a 5x100 bolt pattern for the rear wheels so you would need to do a hub conversion as well. While the Rumion does have a 5x114.3 bolt pattern.
If you are game to do it I say go for it. Just take your time to plan everything out thoroughly, because no matter how much work you think it will be it'll end up being at least 50% more. lol
PS, for larger brakes you can swap the front rotors and caliper from a 2011-up tC right onto the 2nd gen xB. You get slightly larger pads and the rotors are thicker and .75" larger in diameter. I did the swap on mine a few years ago and it works great. You can usually find take off calipers on eBay or at your local wrecking yard for $100 or so.
