Looks good Russell.
Here's an idea if you decide to do the 4 door...
Give it the much better '57 Chevy coupe 'look' by copying the design of say the Mazda RX-8... how they keep the coupe look with the larger sized front doors with door handles; and the semi stealth smaller rear doors without door handles.
For me the door handles on only the front doors draw your eye to those doors.