Welcome to the Forum from another UK builder.
Well that's a bit presumptious actually - I'm only at the scribbling stage!Pity I'm up North (where the M1 is cobbled) - I'd love to see your handiwork first hand! That double wall idea in the hatch is INSPIRED - I've been thinkjing of something similar, and it's great to see someone trying it!
Will you skin the roof of your "bin" and the main roof all in one piece, so you can have a continuous corner moulding right round the perimeter? I think that gives a big advantage, so you can then have your hatch "lid" just wider than the inner wall, and overlapping to create a seal.
Really nice job... look forward to seeing it develop.
cheers
Mal
