I guess that since it was going on a large, professional scope that could handle the weight - the proven design could just be scaled up. But putting that on anything else would be a nightmare. Having a look at the thickness of the cover plate , it would be in the order of 4-5mm. Boy thats a load of weight just there. Not to mention the large piece in the middle of the centre plate.
All that aside it does look a beautiful piece of aluminium.
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