Cool stuff bohunr! As mine evolved I made them from square stock as I found they seem to let the rifle rest on them better. And I noticed you rest your rifle on the barrel (or at least in that video) which IMO is a bad move. I feel it can upset the harmonics of the barrel during shooting.
Ah! got ya....thats not me.
20-somthing years ago I took two old carbon arrows and stripped the vanes so I could do the same thing. They've been working great ever since. They are the perfect height for my wife and daughter, though just a little short for me.It's been so long ago I do not remember what forum I saw it on. Person took 2 3/8 dowl rods, a section of gas line. Folded the gas line in half cut half of it away keeping it one piece. Slipped the gas line over the dowl rods. Took old archery field points, drilled the bottom of the rods and glues the field points in. The gas line makes a nice rest for rifle. Cheap easy to make in any length you need. I still have a couple I've had for over 15 years.