What I would like to see is what exactly is a two stage trigger group. Is it just an american made version of the original or is it more like a Tapco? Hand guards are available as direct bolt on now, this was not the case in the past so that is really not that big of a deal. I prefer the looks of the Saiga factory fore end so I have not found a reason to replace it. Picatinny rails are something I have no use for. Threading the barrel is easy and as stated the tools are available from Dinzag arms (where I get all my parts).
I find it a little funny that people will push others into building their own AR rifle and yet shy away from working on an AK. Yes the AK requires a little more skill to do bigger modifications but most tinkers have those items. A simple shop press and the ability to make things goes a long ways. The same is true for the AR's, special tools are a must to do mods to the rifle other than just bolt on items.
While not a rifle this is my Saiga 20 I modified using parts from Dinzag. I chose rifle sights just because I wanted it to look like my rifles.