A quick 2 cents:
RE: "Seems like having a glued seam would be a major weak point and defeat the propose of the bear keg"
With the exceptions of the Bear Vault & the Lighter1 (which are one piece blow-molded polycarbonate), ALL other approved bear canisters HAVE glue joints: Garcia (which is ABS and has a centered, glued slip joint), Bearikade (End caps are glued on), Bearboxer (centered, glued slip joint), Bear Keg (centered, glued slip joint), etc.
FWIW, a clear joint will visually show the distribution & coverage of the glue application. It won't be a "stealth" joint.
RE: "Not an approved canister":
Since the OP is in California where most of the popular areas in the Sierras (Yosemite, SEKI, JMT, Whitney Zone) require an approved bear canisters - and which any modifications (other than cosmetic) voids the respective area's approval. So, if the OP has visited those areas (& he probably has), he already knows that.
More likely the OP is going to be utilizing this canister in those areas not listed above (which there are plenty!) ... since he has spent time and effort to make his unit smaller, he somewhat implies that in his post: " this is the size i need for a short trip" ... unless he is a road-warrior to make the long drive out to those Sierra spots that require an approved canister for just a weekend trip ... but with gas costs and being busy with life, that's not so likely.
FYI: This isn't precedence setting, as there are other non-approved bear resistant systems on the market, most notably the Ursack (Original & Hybrid) ... which speaking of, the company has this on their website FAQs:
"Won't a bear carry the Ursack away if it is not tied to a fixed object?
Probably not. The SIBBG rangers tested the Ursack Hybrid in both the summer of 2004 and 2005 to see whether a bear would carry it away. They even put a tracking device in it as part of the testing procedure. The results, so far, are that bears are leaving Ursacks very close to where they found them."
RE: "Now you have made it small enough that a bear might be able to pick it up with his mouth. the bear now can pick it up, walk a mile, and then start working at it."
The Ursack post above makes me wonder if the assumed 8" tall lower limit on how short a canister can be is valid or not. It would be interesting to see a youtube of "Fisher" the bear (at the Sacramento Zoo) testing that. But that's material for another thread.