Do you use the towel to wrap the parts together for carrying in the pouch to protect them and reduce noise while packing, if so, you might want to construction sleeves in it to hold small parts and add ties or a velcro strap to keep in all in a nice little bundle. I like the idea and the setup:)
Looks good. What size tank is that? Do you have a rear sight too?and how well do the iron sights work?