Since neither of us is particularly good at woodwork, we made the baseboards out of plywood cut to size by a local DIY store. This left a baseboard kit that just needed a cut-out for the water and then glueing and pinning together.

Above you can see the raw boards for the scenic section. A fiddle yard was added and a twelve inch high plywood backscene. No underboard strengthening was necessary as each board is only 3 feet long. The two scenic boards are bolted, with flat end boards, to face each other forming a box for transit. The completed package can (just) be managed by one person in and out of vehicles and for short moves. 

The layout splits into 3 boards, 2 scenic and one fiddle yard. The fiddle yard is offset as the track onto it is too near the front edge of the board to allow a three way point to fit on any other way. The three way allows one man operation without the operator having to move into the fiddle yard to change trains