Thanks. For some reason my (new) printer decided scans would be PDFs rather than Jpegs. And photo edits in Paint Shop Pro have ended up with rounded corners...
In terms of using all the garden ... I
am management, so that makes things much easier!
Yes, the steam up/cool down facilities are to be by the conservatory. The wall will be higher and there will be some paving slabs/hardstanding on top, so locos and associated bits can be stood on top as well as in the two sidings. The sketch (first of those above and top left as you view it on screen) shows my first thought was going to be a simpler arrangement with a kick back siding but on consideration, I thought a loop and two sidings off would be safer, more convenient and give more operational flexibility and interest. So I did the [inset] sketch immediately below and this is what I am now planning (as per the third screenshotted image, giving some dimensions).
There is building work going on at the moment (I am tapping this out to the audio accompaniment of bangs, thuds and comments about the weekend's sport) and part of this is replacing the old patio and altering the levels and drains - some genius had installed the old patio slabs at the same level as the conservatory floor... a flood risk I didn't fancy continuing with. We will see what things turn out like when the dust settles but provisionally I am working on track height here at about 30 inches from [new] ground level. I would have preferred 36 but that would cause height issues further round the circuit. And I have spare sofa bases to use as kneeling cushions. I also hope to take a few of the existing stone bricks out and install a couple of alcoves so items (whether sandwiches, locos or gas bottles) can be kept in the shade. (Crude sketch top right in the third screenshot). Some of that area is in the shade for 90% of the day anyway. When the civils are done, I'll put in a suitable climbing plant at the back against the wall. One option may be to have a partial overhead trellis for this to grow over but we'll see.
Thanks for the interest, I hope we all enjoy the build and fingers crossed it's not too long before we see some movement.