I also have a 14 strobe Edge 9M, and it is factory built, but it is a 50" model. I traded for it earlier this year from a local guy who bought 3 decommissioned patrol cars from the Temple Terrace, Florida PD. He is going to use two of the cars for a security company and is keeping the bars on them. The car my bar was on has some motor issues, so it will be a parts car, and he let me have the bar from it in exchange for two dual Dashmisers and some clear and amber lenses for the other two bars so he could run them legally. This bar looks like an ordinary 9M bar at first glance and I thought it was a basic 8, 10, or maybe 12 strobe bar, but I was pleasantly surprised when I found out it had 14 strobes. It's the best trade I've ever made LOL.
Mine has the same three power supplies as the OP's bar, and it has the standard 4 corner strobes, with a pair of takedowns and 4 inboard strobes in front, and the rear 6 strobe traffic advisor has a regular warning option that is set to a unique "knight rider" style zigzag pattern when it is not being used as an advisor.
I am considering a slight modification to the rear, as I just acquired 6 brand new 400 series strobe/LED split modules that I may substitute for the 6 strobes used for the traffic advisor since it will give me an additional warning option. I could add the correct internal wiring to use the LEDs for flashers, in addition to using the 6 strobes for the advisor, or I could add an external controller and internal wiring and use the LEDs as the traffic advisor exclusively and keep the 6 strobes in the zigzag pattern fulltime. However, I feel it shows too much amber and is blinding when in this pattern because of the multiple amber outer lenses, so if I use the split modules under clear outer lenses with different colored half size filters over the strobes and amber half filters over the LEDs, it would really set it apart and be effective. Decisions, decisions....
You can see an online pic of the actual bar I have while it was in service on unit 133 in the very first picture at www.flickriver.com/photos/formerwmdriver/sets/72157625147723765/ and further down that same page, in the 8th, 9th and 10th pictures, are some of the decommissioned cars with the lenses removed from their bars and a close up of the front of a 9M bar just like mine without the lenses and endcaps. Enjoy!