Clamping Jigs

[Washout]

Hi All,
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After a couple of tries using L shaped brackets for double sided milling of aluminium blocks, I'm trying to come up with something a little more "flexible" than the L shaped bracket and toe clamps i.e. something that either cuts down toe clamps to a minimum or gets rid of them altogether.
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I have Sketchup'ed something to show my thinking, but rather than make such an arrangement myself, wonder if there is something in the market that is available. The idea is that its essentially two parts/sides of a vice with a locating corner that can be bolted (after alignment) to the T-Slot table?
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Work sizes are in the 200x200x30/40mm area.
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Cheers
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Chris