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I would look at putting other kits/engines that are alreay made into peoples cars and having the only custom part be the installation.
Tons of Jeep/offroad shops drop in Hemis/ wacko suspension setups etc. but all the parts are generally commercially available, just getting them to fit is the hard part.
I think being able to source your parts and focus on the installation opposed to fabrication will be better for you.
that way your customers are paying for parts (engines transmissions etc. + 30-40 hours labor) instead of 200-400 hours of labor which quickly gets out of peoples price range. It also minimizes your turnaround time which means more happy customers driving instead of waiting vehicle-less...
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