Fantastic reference shots and a very cool build idea! I hope it pans out and we get a new CRL out of this. Bravo for taking it on!
The backpack looks quite Sandy-based to me with the little radar dish, toilet plunger thing, and other parts. Is the hose the same CPAP one that Cad Bane uses? Might be worth looking into anyway.
The MP40 pouch looks quite non-leather with the ribbing going on. That's pretty awesome because at least currently, the canvas ones are a lot easier to find than leather. Looks to hang off the shoulder vs being attached to the pauldron, which is nice for movement and visibility. The one on my HWT pauldron can get in the way of my chin at times.