RE: will it fly?
G'day P51,
The Sig Buster suggests .10 as a minimum, but if you build lightly and make sure the balance point is in the correct point, I can't see why the .074 won't fly.
Steel lines are always preferrable but if not available, use what is.
Have you made contact with a CL group, or are you going it alone?
Regards
Greggles