Well, after several hours pottering away in my garage with power tools, I have come up with the main chassis of my bed frame.
The top face measures 90x190cm (single mattress size).
I decided to put the castors on external supports, because it would otherwise mean sacrificing height in the lower compartment, and the top of the mattress needs to be at the right height for anal penetration with my drone lying on it's back, restrained.
Tomorrow, i'll decide on the 'finish'. I have a roll of black vinyl leather-effect material, so I plan to glue it on the top surface and around the top frame, then screw the 'D' ring anchors all around.
The rest, I'll probably cover the bottom surface with the vinyl and use a dark wood stain on all the exposed timbers.
I have just ordered another 24 'D' rings to go around the bottom frame (handy for attaching ankle cuffs to) and a few more up top.
The lower compartment will get fitted with vertical metal bars all around and turned into a cage with a hinged door at one side.
I'll try to find something suitable for the bars tomorrow that I can cut to size.
So far, so good......