I now have the legs complete with stays and locking pins and I've had a clearout to allow the 'layout' to be installed in it's displayed state within the hobby room for work on the track and scenics. All the legs have adjustable feet on now too to compensate for uneven floors and my inability to cut eight legs to precisely the same length!

I fitted a lower brace to the outer legs, improving stability, that meant the cassette ends had to be shortened a little. This was carefully calculated though and will still allow for cassettes with trains (a bit) longer than the platform to be accomodated. The legs for the cassette ends have to hinge in their centre to allow them to pass through between the outer leg bracing. Pictures should make much more sense:

I am pleased with how stable the leg stays have made the structure.

They are retained by R clips. There is a second set inside the legs that the stays are pinned to when folded.

This shows the folding of the cassette leg. It has a locking hinge where it joins the cassette end. These are neat but have some play and despite being stiff I wouldn't recommend them as the sole means of leg fixing/bracing for a whole layout. You can also get an idea of the quantity of door catches that have been used to pin everything together when folded.

A hinge in the cassette end leg allows it to fit within the folded assembly. The hinge on the left has had the pin cut out and replaced by an R clip to lock the leg straight.

There are still no parts that require removal for transport other than the R clips, which are re-used when folded.

Electromagnets (seep) have been fitted to the track sub-bed being careful to ensure that if needed they can be replaced. The track sub-bed has in turn been fitted to the folding frame. Current efforts are focussed on switch operation so that track laying can commence. Getting this far seems like a major point has been reached, but it makes you realise how much further there is to get in the next three months.