I gave my dad (age 70) the mustang a few years ago for fathers day. He was an engineer in the Detroit auto industry for 40 years so I though he could handle it. Said he really enjoyed it but had to grind down a few pieces to make them fit 🙄
Will send him a shirt this year.
There is a way you can tell and it's been 100% accurate for us thus far....
Box A weighs 108.8 grams and contains figures 1,2,3,6,7,9 (based on insert)
Box B weighs 110.0 grams and contains figures 4,5,8,10,11,12
You can go w/ a thinner (more cost effective) acrylic and use wooden frame to reinforce them. Should still allow sufficient light to pass through. Or put in LED lights in traditional shelfing.
You've got some big sets from varying series. Its going to be a challenge even in a dedicated room. One thing I've always wanted to try was to suspend platforms using fishing line so you can change the heights and stagger them as needed.
Muppets 6 pack available on Amazon with 5% discount coupon
https://www.amazon.com/LEGO-Minifigures-Collectible-Role-Playing-Collection/dp/B09Q4N88X2/
Coupon only applies to one pack but you can place multiple orders and get the coupon every time.
Saw lots of complaints that all boxes in an order were the same. Have you had luck getting different boxes?
My Best Buy "VIP Outlet" eBay items just shipped. Thank you @raindog for sharing the info! I regretted selling a few of these sets, but your advice got them back in my stable.