Well.... let's see if I can describe it. I don't have any pics.
I got one of the generic plastic military pack frames. Installed the straps and waist belt. I think that's what your referring too.
To affix the stand to the frame I use fairly thick climbing rope (3 sections), a section of paracord, and 3 camjam xt's, Which are kind of a one way ratchet jamming thingy. Basically it allows Infinite adjustment and slip free tightening with no loss when you tighten it. They work awesome.
I started out with buckling straps. But everytime your load out changes you have to adjust the straps which is a pain.
A super simple description.
Lay the ropes over the stand in a X, and 2 horizontal lines. Tighten and done.
A simple description of how I'd do it....
One rope across the top third of the stand. One rope across the bottom third of the stand. One rope from the top left to the bottom center, and back up to the top right.
Creating sort of a V. The bottom of the "v" is run through a upside down V of paracord with a loop right at the apex of the "V" that the rope slides through. These opposing "V's" create an X and makes sort of a basket or hammock or whatever that keeps the stand from slipping down.
A detailed description...
Attach the cam jams to one side of the frame with a short section (~6") of rope or paracord. One on the top right. One about where a bisecting horizontal line would transect the upper third of the stand. And one where a bisecting line would transect the lower third of the stand. Attach three sections of rope. One at the top left. One to match your upper third camjam. One to match your lower third camjam.
Now make your lower basket or hammock to keep the stand from sliding down, this will look somewhat like an X with shortened bottom legs. Take a ~2ft section of paracord. Attach it to the bottom left and right corner of the frame, and make a loop at the center point of the paracord. The stand will have the seat pointed downwards. This paracord should sort of match the seat and allow it to settle within the upside down V of paracord.
Now to place your stand onto the frame. Splay out all your ropes and cam jams. Center the stand on the frame with the seat away from your back and pointed down. Nestle the seat into the lower V of paracord, pulling the paracord upwards to create the lower half of the X. Now make the top half of the X. Take the rope from the top left, run it thought the loop in the paracord, and back up to the top right, though the camjam and cinch it down. Take the horizontal ropes and run them across the stand and cinch them down. Done.
If you make your ropes longer then needed, you can stuff other things underneath them. Backpacks, animal parts, whatever.
That's a super complicated and confusing description.
I've never seen anyone run a system similar. I came up with it. (I'm a young design engineer). The stand attaches easily and quickly. The cam jams can make noise since they are metal.
The actual pack frame with stand, sticks, and backpack does get a bit cumbersome and tiresome after a mile or 2. That's more to do with the failings of the pack frame. I'd like to try this out with a legit frame such as a kifaru.