There are only two spots on the V1's where you could put a "bolt on" TT kit, they are in the factory cat location or the factory muffler location. Any other spot under the car and you will not have ground clearance, and to do anything in the engine bay would require wayy too much modification to be "bolt on".
Pretty much any of the long tube headers out there I have seen terminate too close to the floor area under the car to mount a turbo and each manufacturer would require different length piping and attachment... again, not really feasible to build a bolt-on kit for headers.
My thoughts on a bolt on turbo kit: Design the base kit around a safe power/boost level for a factory motor (~6-9 psi), and let people modify from there as they wish. Use the factory cat location with factory manifolds. Supply all hot and cold pipes (to mate to factory exhaust location), valves, cooler, oil supply/return, turbos, etc. as a "tuner" kit. Then with enough interest, also offer it as a complete kit with injectors, BAP or replacement pump and handheld tuner as a complete kit for the consumer in their garage (obviously this would require a large enough market to go this far).
Twins typically require more R&D than a supercharger setup, but also have more flexibility in terms of power, so expect it to be priced accordingly. Good luck with this, I will be watching intently.