Code 3 2100/2700/Excal bars are my favorite to do updates on. I have built and upgraded many, using both Code 3, and Feniex products. Have a old code 3 bar without an arrowstik, and want one added? buy yourself a Feniex Fusion 600, 6 L Brackets, and 6 fusion bezels, and you have a brand new, perfectly functioning arrowstik, with decent patterns, and no specialized controller.
Want to update your excal? both LEDX and Optix modules from the 2100, 21TR, etc all fit in the lower deck, and are fairly readily available used. or, Fexiex Fusions and T3s, on L Brackets fit, with mild modifications to the L Brackets.
Far easier to work with than most other manufacturers!
Im also currently working on a project where im replacing the MR-11 halogen TD and Alley with Feniex Cannons...once it's done, I will share Pics and video!