i think if anything if I was to build one I would match the d16z6 motor with a 86-89 integra transmission. I hate breaking transmissions and the 1st gen teg transmission seems to be damn near bullet proof,not to mention junkyards are full of them. The l3 crx si transmission has been raped for years but how many 1st gen integras are just collecting rust in yards with perfectly good transmissions.
Whoever makes a diy home kit for some bolt in action with that transmission in the 88-91 civic/crx chassis I think will have a nice little product.
These vitara motors dont seem to have a weak link its the transmission that needs to be addressed.