if the sheetmetal is going to be covered by something i.e carpet tweed etc. then do sheetmetal but if sheetmetal is final then do audio and work around that with the metal. thats my two pennies.
i want some dimes and quarters, The sheetmetal is gonna be final in most places, but i want some speakers in the doors and in the rear quarters but i was thinking that i could do some fiberglass boxes over the sheetmetal??????
if your not sure what equipment you want to run, then do sheet metal first. theres no sense in doing audio first cuz majority of people change it up after a while for something new. what ifyou mold your metal around a box............your stuck with it.