Sweet piece of work Derf!!!
My bro's been looking into doing the same sort of thing but we didn't think it would work lol (well for it to feed fast enough anyways)
Perhaps you could do up your own molle pack to attach it inside your Rucksack. It would still be secure and then just run a separate remote switch from that to the outside of your Rucksack or to your belt. Just an other idea though
Let us know how it all works in the field will ya!!

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