Jan, the inside of the O scale layout is going to eventually become the Hornby O gauge clockwork layout. Access to it is the old tried and true crawl method because (1) I'm starting to get tired of standing for long periods so I lowered the layout with 36" legs, okay for a chair at times, (2) swing out sections whether up down or sideways don't seem to work out well for me in the long run, and (3) I couldn't think of anything better and was in a hurry as usual "cause there's a half finished boat model that hasn't gotten any attention for the last few weeks plus other projects also that I'd like to work on.