I assume you are talking about making one offs for personal use. If that's the case, don't stop at your BP press block.
There are a multitude of jigs and fixtures for building AKs. There are couple of things in the library. I know that the TG riveting jig that I used to sell is in there. I'm also pretty sure that the plans for 555th's bending jig and plinker762's riveting fixture (The first 3 AK building tools available and the ones that started it all) are in there as well.
AKbuilder picked up where we left off and now offers almost every conceivable tool a home builder could want. Take a look at his line, lots of neat stuff you can make. As long as you are just making it for yourself and not planning on selling them.