cruzie27...
I like your AKS-74, I was going to get into building more 5.45x39 rifles but decided against it. When I built my AK-74 (Bulgarian w/Russian Plum Furniture) ammo was hard to get and now it's impossible. That ammo was always hard to get. So I felt that one AK-74 was enough and focused more on the 7.62x39 rifles.
I was going to get a Romanian RPK but while visiting in S. Dakota I found a NHM-91 (in really good condition) at Cabela's for $280.00. While not a true RPK it was close enough and I replaced the thumbhole stock with the K-VAR Russian Plum RPK stock set.
When you get your RPK finished, please post pictures, I think that they are very cool.
The scope mount is called an AKSMS, it was manufactured by ACE Ltd. A while back I purchased all the remaining mounts that they had and sold them to forum members. IIRC all 30 sold in 3 days, I used two of them and kept a 3rd for a later build. It replaces the rear sight but uses the M16A2 rear windage sight for a BUIS. It not only looks moosemeat, it functions well also.
The finish I use is GunKote "Matte", I like the solvent resistance that GunKote provides. I have tried AlumaHyde II and many others but they don't withstand the cleaning solvents at all. I would paint a small test piece let dry and see how it handled solvents. If it could withstand Birchwood - Casey "Gun Scrubber" I would use it. The only finish I found to handle that was the GunKote.
I know what you mean by taking pictures, some of mine turn out okay but others, well lets say some of them need help.