I'm not totally inexperienced using AKs (zero experience modding, however), I just can't keep all the name variations straight between all the configs and countries.  I also have a problem remembering all the terminology straight.  Thusly, it's hard for me to effectively search, which I've tried.  I found a milled Arsenal with 90 degree gas system that has a thumbhole stock and a pinned fishgill break.  It's a great shape.  

I was wondering if I could add a standard stock, or preferably a folder (from ACE maybe) like the Arsenal folders?

If I were able to add the folder, would it have a ridiculous about of trunion(???) sticking out of the rear?  

Also, what's a good price for one of these?  It is 7.62.

Thanks guys.

Anyone?

Yes the trunnion will stick out, ACE doesn't make a great sidefolder unless you want one that loosens as you shoot, some guys love em', I think they suck. I wouldn't pay more than $400 for the rifle and you can't add the ACE stock until you have five US parts. You already know these answers.