So been a while but have now had time to do some more work.
Over the weekend I built the baseboard, this is built in two halves, each measuring 45" x 27".
The side are made from 12 mm ply 45" long by 100 mm wide, oh don't you just love to mix imperial and metric measurements. The deck is 6 mm ply.
One alteration from the original plan is that there is one central traverser instead of the two planned.
This means that there are only two sets of tracks to line up
Another change is that points 9 and 12 on the mimic plan will be operated by the same switch so reducing the "lever frame" by two switches and an LED .