Sorry guys, I'm not a very techy guy (I still use a flip phone lol) when it comes to electronic, picture posting, computer stuff. But I'll try to describe it as best I can.
The leather scabbard has straps stitched to it that attach it to the horse saddle. After cutting the stitches to remove the straps, and measuring for their new position on the leg, I stamped out two slots for each of the three straps in the scabbard (think belt loops). Run the straps through the "belt loops" and pop rivet them to the opposite leg exactly like the shooting sticks pouch...The leather straps are a little thick and a bit tight between the legs of the stool when folded. I've seen scabbards made of cordura and the straps are heavy webbing, these may work even better than my leather one.
My shotgun has a pistol grip and 18 inch barrel, so I had to open the seam on the scabbard a little to allow the gun to slide fully in. I can easily reach over my shoulder, grab the pistol grip and remove the gun from it's scabbard. To carry a bolt rifle forced me to make another small alteration. Because I opened the seam for the shotguns pistol grip to slide in, it allowed my rifles to slop around a bit. So, I used one of the left over buckles and pieces of strap and stitched them with a sewing awl about 3 inches from the top of the scabbard. This allows me to basically close the seam back up.
Hope this made sense guys. If not, I'll try to elaborate further.