There is a commercial synthetic version of that concept - I think it is called "scope stock", or something similar. I ordered one about a year or two ago, but I just couldn't shoulder it with my spotting scope attached, in a position where it was comfortable or usable at all. My scope has the ocular and objectives lenses offset and my neck just isn't made of rubber. I sent it back (I believe Cabelas). I then tried an old 10/22 stock and figured out how to do some sawing and gluing to make a mounting plate and mount my scope. Like many things, it is an unfinished project, but when I get it done it will work better than the commercial model. Seems like I also saw one mentioned on Boyd's website, can't recall for sure.
The first one I bought had a warning included about being careful where you use it - someone might think it's a rifle. I suppose that could happen, especially in or near a city.