Pretty cool dude. I’m going to do the same this summer/fall; but I’m not drywalling the cieling area/walls; I’m going to use the 1" silver-faced rigid insulation for the ceilings, and firring-strips/plywood for the walls (that way I can hang whatever-where-ever)
Only part I’m dreading is the complete replacement/rebuild of the roof; going from a 1/2 slanted to the rear to a gable-ended 4/12 pitched to the sides…