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

Hey all, long story short, I have been planning a 40x60x14 pole building for some time now.
My builder called me with a surprise opening, and its nearly done.

I am a busy guy, and haven't put much thought into "finishing" it with electrical, insulation, and heat.

Opinions on the following?
Insulation
Spray foam?
Roll bat? This in the walls, blown in the ceiling. Use a good vapor barrier on both.
Foam board?

Wall finish
Osb?
Obx?
Plywood ?
Rather not drywall
Metal liner panels on walls and roof.

Electrical
External conduit if I do osb walls? Go with conduit, much easier to make changes. When you get that lathe you always wanted it won't be a PITA to wire it.

Heating
There is no gas here
Electrical 220 heaters?
Radiant floor heat? I hear recovery is poor and expensive to install... I have propane fired hot water radiant heat. You will never, ever regret doing this. Just an example, middle of winter, -10 degrees, with forced air you open the big door, all the heat goes out the door. With floor radiant, once the door is closed, your back in business in minutes. It also seems warmer. I have my shop set at 45 degrees and it feels like 55 when you are working in it as the floor radiates heat upward heating objects and not the air. Just make sure you have enough insulation below the heating grid.

Obviously not looking to break the bank...so spray in foam may be out...same with floor heating. Just looking to do this logically and not do things twice...or backwards.

Thanks for the opinions all.
View attachment 1715660321