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I started with the bike on the left and drew up a rough plan


Then I cut the bike in half and added a long boom


Then some triangulation and rear cranks

and eventually, ended up with this:

Specifications:
Wheeeeelbase: 163cm (64")
Front BB height: 67cm (26")
Front Seat height: 60cm (24")
Rear BB height: 40cm (16")
Rear seat height: 74cm (29")
Front wheel: 20"  (406)
Rear wheel: 26" (559)
Gears:  2x7 (will be 3x7 later)