look at 
https://newwiremarine.com/custom-marine-switch-panels/
Or you can replace the panel with HDPE sheet (StarBoard). You can add a 6 or 8 switch panel from Blue Seas.
Don't get hung up trying to make it like original.  Think out of the box. Use the space in a modern way with a modern look.
see previous posts on the subject  
http://www.wellcraftv20.com/communit...ad.php?t=21334