Very very nice!! You are a talented 'seamster'.
Well thought out and designed. It seems that we Idaho folks know what we want, can't find it in the stuff marketed to the masses and make the sucker our selves.
There's an outfit in Blackfoot, Dawn Enterprises, that provides work for the less employable type folks. They make stuff for the military, and individuals like yourselt. They've done a couple of projects for me which turned out very well.
All they need is a sample of what you want and they make it. They have about 20 sewing machines and a complete manufacturing staff.
What sewing machine are you using. BTW, did you know that some machines are now being called "stitch injectors"? WWT??
I cobbled a scabbard up just prior to a woof scouting trip in a side by side UTV. It hung from the overhead frame. Designed to jump out grab the brake and yank it out. Then load and shoot. Figger'd bipods are useless in 5' of snow.