Nice workmanship... as Bill said, would be interesting to see the completed work...
When I worked (briefly - '82 - 6 weeks) for a cab and speaker manufacturer there were some exceptionally complex boxes they were making for Iron Maiden - all sorts of speaker sizes in a cab a bit bigger than a 4x12; all sparayed blue... they were also making Trace Elliot 2x12 combo shells, and "Martin" bins...