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@Tijmen
Found some time for dicking around in CAD, came up with this seattube beam fixture, with one on both sides it'd be bolted down with 6 clamps which might be a bit over the top. I priced it up in the calculator of fractory.com and 3 sets (2 of the seattube plates and 4 of the sliding plates each) would be 100 GBP. Not too bad?
Couldn't be arsed to draw up the rest properly as I think your plan is perfect, only thing I'm unsure about is the dummy axle clamping situation, but would also depend on the axles used.
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