I haven't seen one in person, but have seen pictures of how this scope was mounted. Where the rear lock bolt screws in, instead of just a washer, there was a larger plate with a keyhole in it. There was a corresponding knob on the scope ring which fit in it when the scope was held 90 degrees or so to the rifle. When the scope was lowered to the horizontal the rear of the scope was "locked" in. This requires cutting enough wood away to accomodate the "key" part of the scope. The front mount was located just to the rear of the lower barrel band and was a flat plate mounted on a screw which ran all the way through the stock. The flat part had a projection shaped somewhat like a T-Nut groove on a milling machine table. This corresponded with the projection on the scope ring similiar to a T-Nut and there was a stop at the bottom to keep the scope from falling through. Also, I believe that there were hash marks with the range on the plate. I'm not sure whether the wheel on the off side connected to the transverse screw tightened the forward part of the scope in place at the range selected or allowed adjustment of windage. I tend to believe it tightened the scope, though somehow it may have served a dual purpose.
This style of scope was designed to be used in the Creedmore position, lying on one's back with the barrel propped on the leg. I've tried doing that (not with this scope) and never could figure out how anyone could shoot like this. I've seen pictures of men shooting like that but have figured that they were double-jointed or something. Could be I'm just too fat.
If I can find the picture of the kit parts I'l post them. It doesn't show where they go or have any dimensions, but at least it shows what they look like.
BTW, I've also read about the black eyes that the sharpshooters got. I guess with the small optics, they had to get close. I have a very early P-H Whitworth that came with a long brass Tasco Model 1860 scope on it. It is a 15mm tube. And you do need to get pretty close to see well through it. It was attached to the barrel by removing the backsight and pinning the scope to the sight base. The front was just laced to the barrel. Since this rifle was used in re-enacting it wasn't important. If it to be used for shooting I would have to braze a mount to the forward barrel band. Even then, there would be some play at the rear mount. Tasco didn't make the best mount for this scope. And this scope was not the historically correct scope. But, it did attract some attention at the events! and you don't have to lie on your back to use it.