@Cap'n Vic - Based on the dimensions provided I would recommend Panel#
5201 which is 6.5" x 11" which is a standard panel punch size and keeps the cost considerably lower than a custom or special punch. The 5201 has 12 Branch breaker positions which can be wired and labeld however you prefer. The labels are conveniently changeable and we have a library of about 3000 to choose from. You also have the option of getting this panel with (Premier) or without (Deluxe) backlighting which is convenient when monitoring current drain. If there is an interest from multiple oweners I could even look into a custom combination panel which would include AC/DC, meters and anything else that might be needed.