All of that could be dealt with on the mount (base). Just isn't in there. The design with 4 mini-missiles is meant to be cold-launched.I think JQL has one element your design lacks -- exhaust management. But yes, it's in the same vein, especially that patrol-boat installation And that version hits at the reason why you would do JQL instead of something like the ExLS 3-cell launcher -- JQM is a lot shorter. Especially useful if you're trying to bolt it on the upper deck of a vessel like the Mk VI of on the back of a flatbed truck like the JLTV. I think the below-deck version isn't really much better than ExLS except maybe saving some deck penetration if that's critical (as it might be in LCS/MMSC)
I don't understand why LM has never found serious clients for ExLS, and JQL.