But here's what I've got so far, I'll keep this updated over time.
The baseboard is actually made up of three baseboards from Model Railway Solutions:

It was after assembling the legs that I realised there was a problem. The legs are assumed to all go at the end of each board but my end boards are attached to the main board by their sides. Some quick thinking and I made it work by putting the legs in the middle instead of at the end. It means that the corners aren't supported but the bolts joining the boards together mean they are pretty solid.

All of the zero elevation track glued into place. Note 'Wilf's Junction' near the camera. Named after my late Dad. This allows trains to move to/from the outer loop and the inner figure of 8. The furthest diamond crossing forms the cross over for the figure of 8 and will eventually be hidden under an elevated section.



The missing bits are the side elevations which will rise away from the camera to a mezzanine by the wall (the board is visible in the distance but not supported yet), two more elevations coming back down the middle toward the camera which allow for the furthest diamond crossing to be hidden. This elevated section also carries two sets of sidings, four on each side which sit above/inside the each loop of the figure of 8.
The rolling stock is mostly contemporary, several goods trains, an HST and a 'Sunday Special' comprising a Queen Elizabeth 4-6-2 and blood and custard coaches. There will eventually be two Class-08 Gronks consigned to moving stock in and out of the sidings.