I’m working on a Think today, so there are a lot of ideas floating around my head about things I could make to slightly improve these cars:

A shroud for the master cylinder to keep water from dripping on/standing on the brake fluid reservoir causing moisture contamination.
Maybe the same sort of shroud should be over the transaxle vent to prevent water intrusion…
A new cowl design that isn’t so crappy.
A silencer/muffler for the vacuum pump.
Headliner arch supports.
Rear fender liner stiffeners to prevent tire rubbing.
Rear hatch headliner baton.
Scan tool– Raspberry Pi + CAN adapter?