Here's how I set mine up. I wanted redundancy and compatibility with other rockets. Even have room for a go pro on the back side if I cut excess hardware and grind a bit here and there. Fits both 3 and 4 inch bays, literally takes 5 minutes to swap. Currently has an eggfinder, eggtimer Quantum and Quark for backup. Also a pair of 350's and an 800mah lipo. I ran a short cable and rubber duckie out the arse to get away form all the metal...I'm planning on setting mine up with head end dual deploy and wondering where folks are putting trackers? inside the bay with antenna mounted outside on the bulkhead? My preference would be to keep everything buttoned up inside, but worry about attenuation from the all thread. I suppose my telegps is small enough I could attach it to the recovery harness if need be. I'm used to putting them in the nose cone...