One consideration is anyone's dash is probably gonna have some cutting to fit this design. My idea was to come up with not a design specific to the dart, but one that shared enough common dimensions to work. TBD on if that will be the case or not. I'll need to get my hands on some local cars to find out.
I'm happy to take measurements and send pics if that will help your effort. What you are doing is totally hotroding in the modern age and I think is great!