I’ve stud lined the walls and cut windows and doors.
What is the cheapest material for internal lining? I was contemplating a Vj tounge and groove lining or perhaps a light marine ply sheeting - but I’m having a lot of shelving, bunk beds for 4, etc meaning lots of brackets on walls so large sheeting will ultimately be a pain - so other ideas?
Also - I’m going to put a 3 or 4% angled roof on the container, with railing and this will become a platform for some prone long distance shooting - but I don’t want a poor sod slipping off the darn thing, so just wondering if there is a roof product other than colourbond corrugated that might suit this application? I can put in additional rafters etc for additional support if it helps with material choice.
Here’s a pic of what happened 2 hours after it turned up...I couldn’t help myself.

And here is initial site prep being undertaken with a hired 5t - ex. Lots of fun!