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What are you going to be doing in there?
For a home office type space you need to think about how you insulate. But if it's just a shed/workshop I don't think you need to go overboard. Personally I'd grab a load of that silver bubble wrap and maybe sheet the inside if you want it to look nice. Then make sure there is ventilation.
(this is what I will do eventually)
If you can give up the height you can also get quite thin combi hardboard and insulation floor.
Thanks for replying. You're is a great size, mine's going to be a lot smaller - just about big enough to fit a guitar on the workbench I'll build.
I had a heater / thermostat set up in the last one which I'll reuse, just want to make sure I'm not allowing the insulation (which might be wool, maybe PIR) to get damp from trapping condensation in the wrong places.