ABS Plastic Sheet

Decide how you are going to cut the abs sheet: There are several options here. A small hand router may be all you need for basic round or square holes. This will obviously be harder with thick aluminum, but it will be fairly easy for a good craftsman to do with plastic abs board. If you need a very sharp appearance, or exact cuts, you should hire a waterjet cutting outfit, or find someone with a CNC router. Some engravers will be able to not only cut your required holes, but will also be able to route in descriptions under each item by using a two-tone plastic. This is the same process used in engraving your name on the bowling trophy you got 10 years ago!
Decide how you are going to secure your product to the hips board: Most mounting equipment comes with its own screws and screw holes. If yours does not, you will need to find a place to drill a through-hole. The best way to secure the item to the panel is by inserting a threaded insert into the plastic or aluminum,, and then screwing into it. In using plastic, you can accomplish this by carefully holding the insert over its intended pre-drilled hole, and heating it up with a soldering iron until it melts down into the plastic. Sounds easy, but you may want to practice this before you start on your actual panel. You will need an insert puller in order set these into aluminum.
Securing the panel to the case: If your case manufacturer make a standard panel ring, you should definitely use it. It should have pre-drilled holes that have threaded inserts already in them. In this case, all you need to do is use a plastic adhesive to glue the panel ring into the case, and then screw the panel to the ring. If your case does not have an OEM ring, or some other type of pre-threaded securing system, you should seek out a case professional for help.