Not much gaming in October, but my true-scale Rustic Lean-to is coming along nicely. 18mm marine ply would be a bit thick on 30mm square bases, but works nicely in true-scale. Mind you, the sheets are a b*gg*r to handle, and you have to build the roof by climbing onto the roof.
Trebian has the right idea; his 10mm shed cost about £3. I don’t expect to see much change from £6-8k. I’m wondering if I should paint the roof black, shade up to Bestial Brown and then put an ink glaze on to get realistic cedar. On balance though, I shall probably leave it unpainted.