I couldn’t resist building the mock up of the layout on the baseboard. It is exactly as I’d imagined and I’m pleased with that !
I’ve realised that the central scenic part of the layout will occupy less than half of the baseboard area. The remainder will be traversers (on either side) and the invisible interior of the engineering works (along the back of the layout).
I think it’s rather amusing that I’ve built a baseboard and less than half of it will be visible to the viewer 🙂