very nice and Im guessing pretty cheap to build . I would have probably built it just a little different to my liking after looking at and studying your rig . I would have moved your adjustment pin to the back as it would give you a few more inches of adjustment and you could eliminate some of the depth adjustment rail . and I would have turned the jack to where the acme rod and connect are below the gun so you could easily reach under and turn it up or down while still looking thru the scope .
But hey awesome job!!! and far more superior than some of the junk out there for hundred of $$$
I love to home brew my own stuff also , I built a linear bow press / draw board combo posted a couple pics up online and got a email from ez presses lawyer telling me I have used their design which with the drawboard they have nothing like mine , their press fingers need changed for certain bows mine do not , I can press any bow or X bow no matter how big the cam is with my setup without any changes. My acme screw drive was bigger and heavier but requires less turns to go from 22"- 46" but if I proceeded to build and sell any they would see me in court for patent infringement .