Thanks for all the advice, I broke down and bought a Pelican 1750. I've ordered several foam sets and plan to set up three different configurations for flexibility. Not sure just what yet but I'm thinking along the lines of:
1. XCR and DSA Para Congo - SHTF option 1
2. XCR and two Sig pistols - SHTF option 2
3. 300 Weatherby and 12 ga Orion - Hunting special