Addendum:
Please note I was referring to this kind of plastic sheet which shrinks when you bake it, of course. The regular sort tends to ... well, change its shape when you heat it up. How do I know that? - Don't ask..!
:sticktongue:
Easy alternative for those without shrinkray:
Plot the 1:1 scale plans on coloured plastic sheets
assemble the parts
put them into an industrial oven
let them bake for a few days and take out the final result.
Let it cool off for a week and hang it on your ceiling.
:biggrin: