Just had a look at mine, If you removed the legs from the bottom beds and dropped them down to floor level, then dropped the top beds down 450mm you will have heaps of room to mount another bed above them and enough room for those beds to still fold up against the wall.
Then if make up a hinge like on the top of the jayco camper trailers doors and attach to the now top beds you could make them fold flat up against the roof. Just run some box tube across the roof between the bed supports and this will give you a good base to mount some latches to hold the beds up against the roof and make the whole system a bit stronger...did that make sense ?
Good thing is you can unbolt the bed supports off the wall do all your drilling, grinding, welding and painting, then bolt them back in again all done.
Then if make up a hinge like on the top of the jayco camper trailers doors and attach to the now top beds you could make them fold flat up against the roof. Just run some box tube across the roof between the bed supports and this will give you a good base to mount some latches to hold the beds up against the roof and make the whole system a bit stronger...did that make sense ?
Good thing is you can unbolt the bed supports off the wall do all your drilling, grinding, welding and painting, then bolt them back in again all done.