Out of curiosity, what are you basing the specs on? Do you have an original USMC Unertl mount on hand to measure? Are you taking measurements from the mount that shall not be named (we all know what that piece of garbage is, lol)? Or is there anything else you're using to get the specs or a combination of these?
Mounting on a tube for alignment is what's always been done, I actually have the tube that Dan Ross used to alignment the rings on his mounts (which aren't to Unertl spec). Quick, easy and accurate way to line things up. The original Unertl mounts had the rings brazed in place or whatever it would be called. On the underside of every USMC Unertl mount you can see the coloration from the heat when they brazed them.
Since you're doing a box with your mounts, it would be pretty cool to replicate the one that the mounts originally came in. Check out these photos, I can send you a close-up of the box's artwork if you're interested in trying to incorporate it into your boxed set. The Unertl boxes don't have any padding in them, the mounts were just wrapped in tissue paper. But it's probably better to add padding in you box as planned, tissue paper isn't very good at protecting things, lol. The screws and an Allen key were also provided in a small plastic bag. And that's pretty much it for the original USMC Unertl mount packages, not much to it.
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Also, for everyone who's patiently waiting for a good reproduction Unertl mount to hit the market...... good things come to those who wait.
