DIY , local project?
Know anyone with an industrial sewing Machine? Upholstery and Sail /Marine canvas sewers ..
Boston has Boats..
After just one use the seat post is already poking a hole out the bottom
and the sprocket has shredded the inside lining
you may have to reinforce patches against sharp chainring teeth.. ,
that no one remote can guess where to place them ..
And you can get the sewing person to use Heavy Canvas.. and Leather .