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Cheers, I was thinking of 3 or 4x shield bolts through a french cleat, but the wall is the unknown. It's concrete block, but I don't know much more than that. It's moot as I can't get hold of the factory to make it for me since things opened again.
Polygon-
I've recently used some fixings called Corefix to go into concrete block under dab plasterboard. They worked very well but they do remind you that concrete block sometimes dissolves under the hammer drill so it's worth drilling it with hammer off. If you have a lot of runout on your hammer drill you will want to go down in drill size.
I used to have a try at making any fixing suitable for any type of abuse but there is a point where suiting the likely load is more appropriate.
Airhead
Tough one. Wouldn't like to say without looking at all the variables. There are some fixings which give weight ratings, it still depends on substrate though. The shear force of a 5.5mm screw is going to be over 50kgs though.