For the 70’s why not use something that is from 70’s and that just screams 70’s design at first glance!
The Matchbox 1975 No. 34 Vantastic
Based on the 1971/72 Ford Mustang with a custom touch of the wagon rear that was a somewhat popular modification done to sports cars to add more room that never really caught on even the actual automotive manufacturers tried with concept models that never made past a prototype/concept model.
This one is missing the stickers and IMO from ones I’ve seen looks better with out them. The did offer this with a big motor sticking out of it.
This thing is so ugly it’s cool!