Looks good. I cant tell in the picture but if those ceiling anchors are in solid beams overhead, I would just let it hang by those and relieve the stress on the rest of the system. The hanging weight on four anchors is a lot less than the weight on some of those single points. Just use the winch for lifting and lowering, which you might already be doing.
I am debating a similar idea but want to make a full length bed rack that extends over the cab a bit and have my tent, awning, extra lights and gear attached to it but be able to lift it off the bed for everyday driving. Connect it with the bolt on cap clamps or in some other fashion. Still planning this one out.
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