This is a truly amazing piece of work! You're such an inspiration for all of us who want to go a step forward in this nice hobby (for me, at least)!
Just one question and few thoughts about the design: did you gold plate the brass by yourself or you got support from a jeweler? The band centers are amazing, such a fine workmanship!
Next, about the design, two other thoughts: first, you may want to have a screwed finial on the cap, in this case you can make the opening for the clip more easier , also attaching it would be much easier and all will be covered and fix in place by the finial. Which finial brings me to the second thought: you may consider inserting such gold plated brass accessories (bands or cabochons) in finials (for cap and barrel), that will, of course, challenge you more, but, where is the fun?
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However, great job, congratulations!