You could try machining your own "seat pole", and making some handleholds, and then progress to fabricating the whole framecollection - maybe an ovalised downcylinder, a forward sloping topbar, and an overbuilt bottom compartment.
@BringMeMyFix started
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You could try machining your own "seat pole", and making some handleholds, and then progress to fabricating the whole framecollection - maybe an ovalised downcylinder, a forward sloping topbar, and an overbuilt bottom compartment.