On a kit car nothing really fits right in
Unless you get a turnkey car there is always a lot of little stuff to do. Wiring is usually the one that scares people. Having custom fit cv joints and a half dozen brackets for random things takes a lot more time and effort than you would think initially. Even when everything bolts right in there are still a lot of unforeseen problems that show up once you actually try to start using the car. Mainly because no matter how basic the swap you are still taking something that was designed to do one thing and you are making it do another.
You can get a vw style frame that fits most kit bodys and can use a gm front wheel drive setup for the drivetrain but then you are going to be spending a lot of money to get it done. That is the easiest way to do it with no welding. Building a kit car is really fun but it takes 10x the time and 5x the money you think it will to do it right. Just look at my
never ending kit carproject that has not been touched in a few years...