Nice ideas there!
I like your Corian flip-up counter. Ours is the usual dark cherry wood, but I do admit it's been holding up quite well considering it gets wet every time we do dishes. Still I like the Corian as I think it would hold up better to a hot pot.
About the shirt closet shelves. I too added but one mid-shelf. I did mine myself using close-matching-cherry pre-finished shelves I bought at Home Depot, using small "L" brackets to mount. Being we have so much cabinet storage over our no-slide-dinette for cookware & food, we use that shirt closet with shelf for bed/bath linen and miscellaneous.
Thanks for sharing.