We have a similar problem; trying to figure out how to 'smooth' the interior of our dome. Currently our interior walls are the 'skeleton' spray foamed' and painted. The grid is a little hard on the eyes.
This is my fathers house, an apline/40 according to the blueprints its for the 20,25,30,35,40ft. there are only 2 sheets, the lay out of the elevation, base and roof. the other is the hub and leg plat plans. My email is firstname.lastname@example.org and i have the blueprints in my possession since my fathers passing and still own the house.