advice on how to cut passenger side cover for sub

[SteveCZ28]

I got me a set of stealth enclosures for both the drivers side and passenger side...what im needing help with is how exaclty to mark out and cut the spare tire cover panel to allow my passenger side box to go in....i dont want to screw it up, or make it look like a hack job, so does any one have any helpful tips or hints on what to do to mark and cut out? thanks in advance guys

[Blue28]

Use the driverside cover as a template for the passengerside.