Thank you for the compliment. Unfortunately, no plans to reproduce these. Aside from the custom marine vinyl upholstery and the OEM speaker grilles, the pods themselves are widely available on chinese ecommerce sites and from several US based resellers, generically as “70-series speaker pods” or something similar. They are just injection molded plastic over an MDF panel, and a number of Mud contributors have provided various examples of installations.
Like several others on Mud, I mounted the speakers to the MDF panel that nests inside the pod, rather than flush mounting to the plastic. This provides a cleaner, recessed look in my opinion, but at the cost of possible clearance issues with the speaker magnet and the door depending on your speaker dimensions. In this case, you can use shallow mount speakers, or trim some sheet metal.