Thanks for the welcomes everyone!
I'm sorry about jumping in. I know I tend to just assume everyone knows what I'm doing/talking about at first glance which is pretty much never the case.
More complete project description:
I play a card game Magic the Gathering. Specifically the format EDH. You don't need to know anything about it other than one card becomes special, and is set aside. Typically, most people put it into a top loader. A top loader is a 3" x 4" hard plastic case, about 1/8" thick. Thats the important bit. The two dials in the center keep track of my life total in the game (1-100) and the bottom dial keeps track of how many times I used my card (1-8).
Google "toploader tcg", top result is an amazon link and is what I am talking about. Can't post links yet.
The top loader isn't exactly square, and, the opening can be bigger (so I don't have to chisel square edges). My preference would be to just cut the opening a little bigger with the router bit so that the top loader fits without me having to do anything with a chisel. Seems like it would be a cleaner looking finish as well.
The final product is three layers.
The bottom layer is just the full size, with holes drilled out for putting screws in for the dials to rotate on. Currently I'm just using machine screws that are 3/8" long and 1/4" wide (size of center hole in the dial).
The second layer is a backer for the top layer, and bottom corners. I just cut 1" x 1.5" pieces for the corners so the dials have plenty of space. The dials I cut using a circular hole cutting bit (can't post links yet, Kobalt 13-Piece Bi-Metal Hole Saw Kit at lowes looks pretty close)
The last piece is the top picture from above. The last piece is what I'd like to "optimize" production of. I intend to make a few of these as gifts, so if I made one, I'd like to make 4 or 5 at the same time. Thats more what I mean by mass produced. It took me a lot longer than the others, and also is what will be seen most, so I'd like to get a much cleaner feel. My thought was to setup a sliding fence with a couple of stops so I could just lay the piece in, run it back and forth and then repeat for the others I intend to make at that time. Then once those are cut, setup the next phase etc...
I'm starting with 5.5" hobby wood from lowes, and cutting it down to the 3.5" that I need, so I'm not very limited when it comes to extra room to work with. The way I did the above piece was to cut it to width, then cut the holes from the center, and then using a chop saw cut it to length. My thought from all of the suggestions would be to outline my piece in the center of my board. Cut the holes for the center, and then use the table saw/chop saw to bring it down to final size. Basically use an extra inch around the outsides for stability while I cut from the center.
This is where I get into concerns of safety etc. I don't know what the strength of most woods are, and even more scary, the stupid things I am doing that I don't even know. I took a class for beginning woodworking, and took away a lot of things from it, like don't stand where the board can be thrown, pay attention to the grain and the direction/type of blade. Just like the idea of running it by someone else and they say something a lot better than getting called Frodo of the Nine Fingers.
Attaching a picture of a more completed prototype.
Thanks again for the welcome and the feedback