Blank canvas, steel sided 40x60 pole barn. Thoughts on insulating, electrical, heating???

My shop building is 40 x 80. I finished of the front 1/2 with bat insulation in the walls & blown insulation in the ceiling. Walls are covered in white steel. All wiring is outside of wall run through conduit. Lighting is T8 fluorescent.
The back 1/2 was originally just going to be used for storing cars & camper. Then I started to occasionally working on projects back in the back part... but found it was Super cold in winter & hotter than hell in the summer. So we spray foamed the back 1/2 ... & have screw in LED lights in the porcelain fixtures. It is not finished off. I can heat the whole building if i want to. I have LP furnace mounted on the ceiling & use wood furnace while I'm working in the shop. IMO spray foam is the way to go for insulation... NO drafts Anywhere!!!