Maybe use a mirror to take the pic?
There's more than one epoxy compound suitable for the job. Just be sure to de-grease and perhaps slightly "roughen-up" the area(s) to which the epoxy will be applied. Ask me how I know, lol.
In the (quite likely) event that CA passes yet another anti-gun law which bans all semi-auto rifles which can take a magazine, a mfr/vendor called MagLatch makes devices for many semi-auto rifles which will allow a CA-legal magazine to be installed, the magazine latch to be (reversibly) blocked, and the rifle will then be compliant. Being in CA, perhaps you know more about this than I do, and I will appreciate your advice on the subject. I have bought such devices for various types of semi-auto rifles which I own, "just in case". Always willing to learn from those having more experience than I do.
Cogburn Arsenal is a vendor/mfr that you might want to investigate; many interesting Mini items there as well as other stuff. Not to belabor a point I was making earlier, but in a worst-case "legislation" situation, the Ultimak Scout rail + RDS allows a "Stripper Clip Guide" to be installed over the receiver and the Mini fed like an SKS. If a 10-rd magazine can be used in conjunction with a MagLatch device, the Mini is still useable and technically compliant.
A simpler way to "comply" with such laws concerning semi-auto riles would be to make a straight-pull rifle out of the Mini.
This is most easily done by replacing the OEM "Gas Port" inside the gas block with a similar item which has no internal gas port; IOW, a solid cylinder which prevents gas from escaping the barrel and actuating the Op-Rod. Simple and reversible. You, being a "hobby machinist", should find this to be child's play to make. I wonder if Minis exported to such countries as the UK have this done to them by Ruger.
At any rate, if you are conversant about modifying semi-auto rifles to be "compliant" with the law, I'm more than willing to listen.
Most strongly suggest that you visit the two forums I suggested previously. Reason is you are getting my opinions, and just might benefit from the opinions of other Mini users. I don't think most experienced Mini users will disagree with my suggestions/opinons, but maybe others will have better ideas. Nothing against this forum, but it is kind of "quiet". Strongly suggest you obtain the benefit of the opinions of other experienced Mini users. I sure don't know everything, and I admit it.
All best wishes!