Forget the cass. player.
Go out and get a Cd player!
Use your stock spot and get a 1st or 3rd gen Integra console.By doing that and getting an aftermaket Cd player,one you'll have more space with those consoles and have a cig lighter/cup holders etc,and two this will solve your dillema of what to do.

Cliff notes:
Scrap the cass/cd player reloating your cig lighter combo idea.It is more work that can be avoided by....
Getting a new cd player,use the stock spot and get a 1st or 3rd Gen Integra Console.Problem solved!