I made my go-kit from a used SKB-brand 12” high rack case that I found on ebay. Nothing really remarkable about the radio gear or how it was installed. What I want to share are thoughts about exploiting unused areas for storage.
FRONT LID - My SKB case has a 2" deep front lid. I put a hinged plywood cover inside the front lid and partitioned the space underneath with a strip of 1x2 topped with white plastic. The plywood is attached to ½” angle aluminum pop-riveted to the metal band inside the lid. The storage space is handy for keeping copies of go-box equipment manuals as well as maps, a repeater directory, notepad, and a ditty bag for pens, pencils or whatever else might fit. When the plywood cover is closed the lid doubles as a lap desk. A magnetic catch keeps the plywood cover closed.
REAR LID - The rear lid is a ½” thick corrugated piece of formed plastic and now sits on top of the case like an easel. It simply sits atop the case between white strips of plastic cutting board mounted to the case. (The clock shown in photo just sits there and isn’t affixed.) The lid is propped up from behind with an aluminum leg that attaches to the top of the lid and the top of the case with knurled screws. This leg tucks into the spaces of the inside surface of the lid for storage when not in use. Two clipboard-type clips mounted to the inside surface of the lid hold reference materials close at hand, like a map, frequency list, or operational plan.
HEADPHONE HOOK - Last, but not least, I wanted a place to hang my headphones when not in use. The corners of the SKB case have recessed areas that were perfect for mounting a hinged piece of bent steel (hook) and a magnet glued to the case. When closed, the folded hook is out of the way and affixed to the magnet -- but when opened it conveniently keeps my phones at the ready.