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@bavski
The frame weighs (ahem) quite a lot according to *Solidworks 2008 *but the complete saddle/post unit is comparable to a brooks saddle with an alloy seatpost.
The membrane is attached by the catch mecahnism which is illustrated in the (not very good) sequence I attached with the initial post. Having tested a working (think ugly) prototype it does seem to work, even with inferior, untreated leather of half the desired thickness.
I think it's totally do-able, but I'd also agree that it would certainly not be suitable for use on a BMX...