Hooray! Progress was made, all be it small. The outside is now resined and the inside it rondoed. Even with the rondo application, I still feel there is too much flex at the corners and joints. I am now going in and adding a layer of fiber glass mat. Unfortunately this may make it a bit heavy, especially with all the stuff I am planning to add (to be revealed later). I still have to find a pattern for the cover. I have some cow hides with the hair still attached for this, should look rustic.

I have been thinking about the attachment mechanism. I believe I will use hard driver magnets in tandem with some leather straps that will attach to either my back plate or vest. I'm not 100% on what I want to do. I would like to have the option to not wear the pack and no one be able to tell... and I would prefer not to build a harness, thought it would solve the problem.
Anyway, I'm going to finish up the inside this weekend (hopefully), add a final touch up resin coating on the outside and start priming it for modification.
Photos with back plate for size comparison:

