I've heard of this GTXR2...I've also heard its not for the faint of heart...
BP, and BPT are possible and have been done, RWD is possible but would have to be nearly 100% custom. There are no parts that would bolt on, and a massive amount of cutting and custom fabbing would be required.
BP and BPT require cutting of the framerail, modding engine mounts, modding the jackshaft mount, and all sorts of rigging for the fuel lines and intake piping. Its really, really tight.
The KLZE has been proven to fit in a BF 323 engine bay, but noone to my knowledge has ever crammed it into a capri. I think the KLZE requires a different gtype (i'm not positive on that one) but that would require custom or hybrid axles. Would be a screamer though!