We worked on the installation of the center panel including installing (or trying to) the Avidyne IFD540. The tray had to go in first then the center panel and after many tries - it didn't fit. Calls to AFS resulted in taking hacksaw to the sub panel sheet metal behind the tray. Turned out to be pretty easy to do and I believe actually strengthened the sub panel, once 3/8" lip was bent to allow the tray to fit properly. Great - not so fast. Once fitted in place the nomenclature on the switch panel is not legible from the pilot's perspective without bending down to be sure you touch the correct switch - can you say vertigo? Working on that issue later. Installed the ACM with no problem, but it did take more time than I thought it would since I used nut plates rather than bolts, just in case it needs to come off at some future time.