Please don't sell yourself short, with a collection like this, you're far from being the low man on the totem pole. Now that I've sold most of my M40xx stuff, I get to claim the low position, lol. You've put a ton of time/money/effort and, most importantly, dedication into this outstanding collection. Your M40xx collection is easily one of the best ones out there, and it would be great to see some more group photos of these rifles.
Looking at your group photo, I can see that you might need a few parts from me to help round out your collection. I have a few different versions of the M40A1/A3 Unertl scope cover and some welded M40A1 transitional scope mounts. That's if you plan on building any of the vintage M40 and M40A1 sniper rifles. I have Major Dick Culver's original USMC M40 available, if you want an original rifle instead of a clone build.
Your collection is excellent, especially when it comes to different variants of the modern M40xx's. Please let me know if you're ever interested in building the older M40 and M40A1 rifles, and I'll do what I can to lend a hand. And we're all looking forward to seeing more photos of your collection!