Lovely nostalgic designs Robert. I always liked the big amps of the 70's myself with brushed aluminium fascia, machined dials, UV meters and teak cladding!
I did an amp panel for a sub woofer that I had built and that was a learning curve for sure, it helps I have a background in graphic design, but it was a steep curve learning about etching, screen printing, water cutting etc...
Would be more than happy to help if you need any, although you look as though you've got most things covered and have a clear idea of your products look and feel.