Selling a home without building permits
Well, 6/3 with a ground is more than sufficient for a 50 amp panel, as long as the panel is bonded to the house panel or has been grounded by a seperate rod if the 6/3 doesn't have a ground. The outlets should be wired in accordance to code...here in Michigan a 15 amp circuit can run on 14 guage wire, but the 20 amp circuit needs to be 12 guage. As for the sheetrock, in Michigan all that is required is that it be fire taped to pass, meaning one coat of mud and tape. I wouldn't worry about the work not being done with a permit as long as it will pass inspection should the buyer or the seller request an inspection. All the inspectors usually do is make sure the circuits are wired in continuity, no open grounds or loops. Until recently, no GFI was required in a garage setting, only in kitchen and bath applications, and only if the outlet was within 6' of the water. I think it's required now in Michigan too, and only the first plug need be GFI and the others run off the load side in series.
Most times nowadays, all the building dept. is interested in is the $$$ for the permit.. Here in Michigan it's $50.00x the number of inspections a permitted job requires. You know it's gonna be a $100.00 bill as they want a rough and a finish on everything!!!Hope this helps, Geof