Good luck.
I've BTDT.
If you finance it yourself, you'll get alot of interest, like HB has.
I tried it as a group type buy on gunco, having them cnc'd, your choice of white/blue/park finish, minimum run of at least 50 up to 100(100, based on anticipated demand) & when the rubber met the road, no-one, absolutely no-one budged. I couldn't foot a $2,500.00* shop bill, so I killed it. I had a public list on the board as well. So, I made them by hand, sold them at gunshows & on a few boards by word of mouth. Mine were(& will be again) 4140 chrome moly & can be used to launch. HB has a disclaimer, basicly, his are for staitc display only.
BTW, HB is not going to do another group of launchers anytime soon, read his posts on gunco. He said at least 6 months.
On this board, you should get alot better feedback. Member's on this board that I've dealt with so far have been straight-up & honest. I think the majority here are serious about their hobby.
*since last fall materials have shot up in price.