BTW, joking aside and when I've finished pulling JRs leg, when you look at them arranged like this it would be a VERY simple affair to double up, as I'm sure he is thinking. Full dimensioned sketches on request, the frames could be knocked up in an hour by a cackhanded welder (I suspect mine were, to say these are factory items the welding is absolutely crap. I'm no timeserved coded TIG boy but I can weld better than this and even if I can't I have the good sense to disguise my shame with the application of a grinder.) The wood is simply a hardwood plank, you could of course use ply if you preferred.
Go easy with the criticism of Quad's welding. AFAIK the factory only supplied a drawing, never the finished product.
I had stacked 57's for only a short time since I just couldn't get back far enough from them.
I now have 989's. I'm looking to move house, but now realize that English houses (other than country mansions) are really not designed to accept hifi. I've looked at hundreds of houses online, none have the 'right' shape of room.