I've got one foot in the past myself -- and plenty of flats left to bend. I'm in it for the fun, also, and made my own bending jig. I also made a very nice bender for the upper rails, which doesn't work very well. I enjoy making the tooling, and have been adding a few bits to the shop.
The experience all counts toward the next build, I think, and has made me able to tackle the 80% and 100% recievers with a little more confidence. And I'm no beginner with this kind of work. Let's just say I'm getting real d*mn good at drilling holes! And I now have an excuse to buy cobalt, carbide, end mills, reamers, and so on.
No drill jig here; I just built two milled [eta:80%] rifles the old fashioned way. A good drill press (mill/mill drill) is required tho' -- capable of shooting holes at true right angles to the work.
What bender do you have? Those bends just look great.