I would personally get a fixed stock Romy, and then buy the folder stock separately later. They are going for as little as $55 on gunbroker if you watch closely.
Yugos use something more like the RPK receiver. NoDakSpud.com is making receivers for the Yugo rifles, and the parts kits/receivers for Yugo and Romy AKs are not interchangeable.
The Romy Kits area far better deal...$89-109 (depednig on source, go to FALfiles and buy ROmy kits from Bocefus, I have and have been VERY pleased) and you get an excellent to unused condition waeapon with a chrome bore. The Yugo kits have anywhere from fair to unuseable bores.
I have two Yugo kits on the way from Centerfire that should be here tomorrow, and will let you know the bore condition.
FWIW, I bought them because I already have 5 excellent and 5 unissued Romy kits sitting around, and wanted a nice companion Yugo AK to my underfolder Yugo. The fiexd one is getting a grenade launcher replica on the muzzle from Hotbarrel at AKfiles.