I've built a couple of Romy G's (riveted) and they're a ton of fun to build & shoot (I like to tinker + I rivet things together for a living). I you want to do serious training, either run an ultimak railed gas tube w/Aimpoint RDS or upgrade the irons to either Mojo, Krebs or XS Big Dot sights. Note: The Mojo windage & elevation adjustable rear sight is too fragile for serious use. I took Magpul Dynamics' Carbine II course with one on my rifle and the all of the adjustment screws came loose after the first day (all were secured with blue locktite).
I use the Tapco G2 single hook trigger parts kit, Tapco AK74 muzzle brake, Ohio Ordinance receiver & a KVAR stock set for my compliance parts
Folks poo poo the AK-47 but they are extremely rugged/reliable (I had no ammo related malfunctions after +1700 rds. during this class) and you don't have to worry about recovering the brass to reload

. Most are capable of combat effective groups out to 300 yds. ("minute of man").
Good luck with your builds. Feel free to shoot me a PM if you have any questions. There's a ton of info about building on the AK47.net & AR15.com forums.
ETA: With the Mojo rear sight and XS Express tritium front sight, I can shoot 4" groups w/ Wolf ammo @ 100 yds. Plenty accurate for it's intended purpose.....
Jeff