Finally I have something new to add.
This week I built the traverser. For anyone wanting to make a similar one, the frame is built from ply on the ends and top, and 65x12mm dressed-all-round pine. The frame is 1450mm x 450mm, with the left-hand entry being 250mm long and the right-hand one 200mm.
The table itself is 40x18mm DAR pine and ply on top, and measures 350mm x 990mm. I bought 300mm drawer runners from this company online and received them by courier within a week for about $27 all up.
Here it is with the table fitted, showing the construction
And when complete.
The handles were from Bunnings and just add a nice finish.
In the picture below, the table is fully extended out. When installed, the entry road will align parallel with the inner right-hand side of the table.
Once the drawer slides are fully closed, you can see that the entry road now aligns with the inner left-hand side of the table.
Pretty straight forward idea, derived from a lesson learned on my previous layout where the drawer slides I bought from Ikea only allowed for a 200mm traverse, despite being 300mm long.
Next job is to build the legs for this, and the right-hand return loop. Both should be fairly quick jobs, so it won't be long before there's some more permanent track down and I can move from carpentry to modelling.