I'm doing the standard head scratch as I think through where everything should live behind the panel. I have a 9A tipup, and my hope is to be able to make as much as possible accessible between the panel and subpanel so it can easily be accessed without doing the upside down limbo. I really don't have any desire to cut access holes in front of the subpanel. My panel includes two AFS screens, and I think I'm going to copy Dynon's offering and make a tray that attaches to the rear side of each screen. This should reclaim quite a bit of real estate to mount devices that won't otherwise fit on the aft side of the subpanel (I already have an ACM, ADSB, Transponder, and Radio on the subpanel).
My question - is there anything that I SHOULDN'T consider mounting behind the screens on this tray? I'll keep a path clear for the fans to move air. It seems that the most common items that get stuck on the firewall side of the subpanel are things like the engine monitoring box and alternator voltage regulator type things. Is there any reason not to bring those a bit further aft and put them on a tray like this to make them more easily accessed in the future?
Is there anything that just needs to forward of the subpanel and really shouldn't be located behind the panel?

My question - is there anything that I SHOULDN'T consider mounting behind the screens on this tray? I'll keep a path clear for the fans to move air. It seems that the most common items that get stuck on the firewall side of the subpanel are things like the engine monitoring box and alternator voltage regulator type things. Is there any reason not to bring those a bit further aft and put them on a tray like this to make them more easily accessed in the future?
Is there anything that just needs to forward of the subpanel and really shouldn't be located behind the panel?

