After many years of owning various firearms, repairing most of them myself, I too have accumulated a good assortment of gun parts. My inventory is more of "I know I have one of those", rather than being well organized like yours, but it's nice to have "that spring" when you need/want it.
Funny you should mention the wooden tool chest. Not being handy with tools of that nature, I had to purchase mine. Now, my firearm repair tools and parts are all in my dandy Gerstner tool box... I can finally get away with leaving "my stuff" in the living room as my wooden tool chest looks like it might belong there.... It sure was a step up from my Plano box!
I'd rather of built it myself, but I need it to actually hold something...