my initial thought was to center it with the rear port wall, but it's not my box.Sub placment will not make a drastic change from one position to the next. Placing it behind the port wall would be optimal. But you could place it in the center if you choose.
Yep it's a lot easier than dropping the blade slowly in to the wood to form the cut.first time using a jiz saw... should i drill a hole first and stick the blade into the hole and start from there?