get a SW20 turbo half cut and you have everything you need to do the proper 3SGTE conversion, including stronger engine, gearbox, driveshafts, etc.
not to mention all the other bits and pieces you'll require like intercooler and piping and all the associated brackest and mounts, exhaust, hood cover with the raised vents and fans for increased cooling... and imagine having to get hold of or fabricating all the other little bits and pieces like turbo oil drain, etc... the list goes on and on...
with a half cut it's all there just waiting to be swapped in with no hassle and no stuffing around.