Thank you both for your thoughts. I have been told about shrinkage of the ceiling, and advised by the builders not to have it painted for about 6 months. The electrical arrangement is that there are three breakers in the fuse box: one for the lighting, one for the lower sockets, and one for the upper sockets, the latter being intended to be used for air conditioning. It seems rather excessive to turn off the layout at a circuit breaker every time that I leave the shed. I may well acquire wi-fi operated plug sockets, however, to allow the layouts to be turned off remotely.
In relation to lighting, the photograph of the shed when lit shows only one of three banks of lights lit. There is, in fact, a light directly over the large window. Further, I intend on buying a bright angle-poise desk lamp for the purpose of working on detailed modelling at the work bench.
As to the garden fence, may I ask how one would go about preventing it from being lifted? Could a burglar not simply climb over the fences? (There is a double fence at the back: one is mine, one is the rear neighbour's).
As to carpet tiles, would that not generate too much dust and make it too difficult to find very tiny detailing pieces of N gauge locomotives or scenery dropped from the workbench or layout?
I am not sure that kitchen cupboards will really quite be the thing, as they are not really intended for working at a sitting height.
In relation to the window position, the trouble is that I had intended this window to be directly above my work bench to maximise light; if I am to have the planned reversing loops (even with some considerable compression of the lead-ins to the fiddle yard to reduce the linear space that it takes), only half at most of the workbench will be directly below the window. The window handle protrudes into the room, and so the layout boards could not go in front of this handle directly even though the window itself opens outwards. I was wondering whether it would be possible to have some sort of hinged arrangement for the reversing loops (since this is all that would need to go in front of the window), but I have no idea whether this is feasible or how this might work - any thoughts as to this would be appreciated.
(As it is only the reversing loop rather than the storage sidings that would intersect with the window, I doubt that fading would be an issue in this situation).
Edited by jamespetts, 17 June 2018 - 10:35 .