This input is really great for expediting the project.
It sounds like the F4 "conversion" would be a win for me; I just saw some forks online for the F4 that were inexpensive and I'll guess more F4's were made, (so more were wrecked,) than 919's. I'll just get a fender because my 919 fender is cracked anyway.
Later, with an additional splash of cash, I can do an adjustable rear. I assume the suggestion for the re-spring on the fronts, F4i, is to account for the weight of the bike? and I also need to dial it in to my 190 lb rider weight.
I'm eager to bring this to a conclusion and get the parts.