The full engine/tranny/suspension/subframe transplant is interesting.
But it seems to create more problems to solve than a standard engine swap.
You'll have spring rates, shocks, track width, ebrake and a bunch of other stuff to sort out. I can't see adapting the front of a jetta/golf to work in the back of bus being easy.
Good luck with it whichever swap you decide to do.
And thanks for posting your progress and the pics.