cut it in half. right down the center.
cut out the rails, front and back, so you only need to bend a few inches worth (in the middle) not the whole 12" !!! now, it's easy to clamp it in a vise (between to peices of bar stock. and bend it over.
now, take each half, and grind, belt sand the rails so they are the correct width, and clamp them in the trunions, using rivets to hold everything perfect.
put your bottom rails in there, weld them in place. it's easiest to take it all apart to do this.
take some 1 1/4" X 1/8" bar stock, and slip it in there, weld the side plates to the bottom plate, and there you go. easy as pie, and very few tools required.
grind down your weld slag, and put a flat on the bottom, spray paint it, and you will ahve a pattern to follow when you cut out the trigger / magwell / pistol rip nut holes. you can choose to thread the bottom plate instead.
I welded the pistol grip nut and trigger guard to the bottom plate. I haven't cut out the mag well yet, still thinking about leaving it a single shot.
I drilled a hole in the gas block crosswise and tapped it for 6mm put a screw in there. now nothing cycles when it goes boom.
I may leave it here... but knowing me, I'll be cutting the hole for the mag well, and either welding a 5 round chinese mag in there or scratch building a mag latch. (I was missing one)
I'll probably just weld in a chinese 5 rounder, and modify the follower to let it hold 7
the final step is to take off the gas block and handguard retainer, AGAIN
and build a little pump action hand guard, and attach it to the bolt handle.
it'll be a 7 round fixed magazine, pump action AK pistol
I used a AMD 65 for this,
right now it's just a single shot AK pistol, with no hole for a magazine.
the good part about all this, is it lets you trim the rails easily, and bend the top rails with vice and hammer.
And you only have two bends to make,