Brent Yeah - I see the 40mm piece of timber stuck in the underneath base plate - gathered this was fixing down. Mine had rivets all around the outer edge - the donor vehicle had completely rusted away here - the gutters completely dissolved - we think the transport over from South Africa had been on top of a ship - vehicle exposed to the elements. I was thinking of simply sticking the roof down when its ready to fit - using Slikaflex - maybe screws through front and rear fixing holes - and heavy weights - what do you think? I'll make sure the roof cut is properly re-painted and sealed before fixing the roof down. I might (in my usual fashion) look at adding some bracing around the van roof edges after the cut? I see in the new T6 campers - Trakka (my brother has one !) use a section of fabricated steel running length wise under both cuts. Yes - van in background photos is your old tin-top - you wouldn't recognise it now - all white paint is gone, all dents, nicks, scratches gone. Seams all re-done. Any rust removed and fixed. Only white paint left is on the floor in the rear load area. !