I checked at Conestoga's website, and it appears that you're right. Their solid wood drawer boxes use 5/8\" material for the sides.
I have dealt with Conestoga off and on for years, and they used to have other options for drawer sides, and since it's not spec'd out on the Member ...
I assumed that the \"Change\" button was to change the wood species, not the color or finish (especially since I had selected to purchase the doors unfinished.)
I'm working on a design for a multi-piece cherry vanity setup.
The client has selected a very dark finish (Kraftmaid's Peppercorn).
I've setup the cabinets to be placed in the design, but since I'm using Conestoga's TW plat panel door in cherry, the images all show a natural cherry finish. Much ...