First I need to thank everyone here for all of the ideas and inspiration.
I am going to be using a Yugo trunnion, bolt and carrier. Then a .308 barrel, FAL mags, FAL gas piston, FAL gas block and custom gas tube. I think I will end up removing the FAL sight bits from the gas block and using either an AK or AR front sight post out on the end of the barrel. Hinged receiver cover with a G3 rear sight.
Tonight I was able to turn down the donner FAL barrel. Barrel is pretty toasty so I am just using it for a proof of concept for the build. Later I will get a new heavy barrel from Brownels and then make up my own gas block.
Here is the barrel pressed into the trunnion. Front furniture in place and the mag in place. Gives a good idea of what the final product will look like.
The bolt and extractor have been dremelled.
I am using FAL mags because I believe they will be able to be used without any mod to the mags. Just narrow the AK mag release. This way they can be used for this and FALs.
Unfortunately with the way I work its going to be at least 4 months before I get to the point where I can test fire