My former 1975 Opel Rekord project:

Was: 1.7L 84hp - 17S engine, 4-speed manual, severely rusted, rotten interior

Plans:
2.0L 122hp - 20SE engine, R25 5-speed manual, bigger brakes, tuned, lowered, bigger front swaybar +++
 

This car never really got going, and while I collected a lot of parts for it, nothing happened. Then I bought some other cars, became a student, and my Rekord was just forgotten. It's now put to rest. RIP!