I will have a web site very soon where you buy one. In the meantime I'll sell you the platform, the 5MOA / .05" can't circular level etc for $95. Just go to eBay and search AcurC Rifle Scope Level. It's very well made and the platform has many other handy uses for your rifle other than...
That is hilarious! Seriously though I have developed this method geared toward the ultra long range shooter. Enjoy and thanks for the laugh.
https://www.youtube.com/channel/UCrUdPJToKibHd22VYb7yavA
For ultra long range shooting this is a more precise method but I'm sure your method works fine for what you are likely doing with your very cool rig. Nicely done.
https://www.youtube.com/channel/UCrUdPJToKibHd22VYb7yavA
This will solve your issue of aligning the bore to your vertical crosshair. I had the same problem as you once on a savage rifle.
http://m.youtube.com/channel/UCrUdPJToKibHd22VYb7yavA