I had been out of 40k since 3rd (sold armies, etc), then some buddies got back into it 10+ years ago. Not having the funds at the time, I built an army from shrink-film.
I had to print out images to trace and do the maths so the final result was passable. This is why I made a conversion ruler (original length in blue, final size in red).
I never got around to vehicles or walkers, but I was designing some slot-together bits.
Wow! This was super creative. When we were broke teens, we played warhammer with regiments represented by index cards with 30 axedwarves written on the card. Then scratched out to write 29, etc.
We used to do this with Warhammer Fantasy Battles in college!
We had access to a laminator so the paper was cut out to the regiment size and we could use dry-erase markers.