Non winterized cottage has not been changed in over 60 years. Previous owner describes buying cottage with bare studs on inside and installing panelling with insullation batts at that time. The panelling has actually stood up well, so we will probably simply prime and paint it. I am confused as to how this vertical panelling was installed with typical wall framing. Would there be plywood underneath or drywall, or cross bracing between studs. Panelling ha snot bowed in all these years. I want to move a few walls (the dark wall in front is bedroom wall that I want to move out a foot), but before I start, wanted to solicit advice and thoughts on old cottage design... [ATTACH]55881[/ATTACH]

So I insulated my Garage last winter when I bought my house. I put up plastic sheeting on the ceilling to help hold heat in. I was planning to finish the walls/ceiling soon here with drywall, but realized today that that might not be doable. Not sure on exact measurements but my garage is roughly 30ft wide by 23ft deep. and has ceiling joists (may or may not be correct term) 4ft on center. They also arent even 2x12, I didnt measure them but they arent bigger than 2x10 and they are all 2 boards held together (end to end) by that metal plating that just gets hammed or pressed into them. and then theres a 1x4 running from that section to the roof peak to ad support to them i guess. Can these support drywall?