Great work Northeaster! Here is my 3030 in a custom cut SKB case as well. The cables are in a slot that is cutout between the 1st and second layer of foam - between the screen and the arm rest. It's traveled to 5 different countries with zero damage....in Japan now!
There are three (3) layers of solid foam on the bottom; two (2) pieces that are 2" thick and one piece that is 1" thick. I laid the detector on the foam, traced it with a black sharpie, used a thin utility knife razor blade (4") to punch through the foam and saw out the pattern - then I finished it up by spray painting the foam with Krylon Fusion indoor/outdoor paint. Very easy to do - takes about 30 minutes from start to finish if you are taking your time. I use the same cases to store my rifles - custom cut that foam too. The case is air tight, waterproof and lockable!
Specifications: SKB iSeries 4217 Mil-Spec AR / Short Rifle Case
Interior Length: 42.50"
Interior Width: 17.00"
Interior Depth: 7.50"
Carton Length: 45.50"
Carton Width: 20.00"
Carton Depth: 9.00"
Shipping Weight: 27.00 lbs