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Terry, Looks like an old Samson mount from Astro Optical. Designed by Alex Stern back in the late 60's. Aluminising: you have a variety of options
The ASV has it's own aluminising plant which is run through our Instrument Making Section (you have to be a member though to utilize it) we can do up to 12" I think? Then there is Chi Qin Co (that's pronounced Chi Chin) in Campsie NSW (they can do an overcoat for you too). Also Astro Optical offer aluminising.
I would look at modifying your secondary cell. There is too much obstruction by the cell itself and this should be minimised. You would have to make a smaller cell so that the actual mirror edge makes the obstruction. (See MAKE YOUR OWN TELESCOPE by Richard Berry.) Also look at replacing the old focuser as well for a more readily operatable one!
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