Well a couple of weeks have gone by and I have managed to finish some more boards so that the 'Apex' of the U shape of the layout is now complete. However I ran out of batten timber. I am now approximately half way though the board building process - 23 required plus two 'bridging' sections at the base of the U. Each one has to be built and slotted in individually, and as the roof timbers dont line up neither do the boards when they are in place. More on that later.

The boards sit on brackets screwed to the roof timbers. The eagle eyed might notice that the visible support bracket is a different height, I have lowered the entire layout about 5cm compared to the old one- while I cant sit upright under the boards anymore I can reach the undersides comfortably while lying on my back. When im sure I wont have to take them out again, I can screw the baseboard sides direct into the roof timbers. Each board is modular and can be disconnected easily from those either side.