I really tried to learn inches… but failed. My brain doesn't accept them.
So I wrote a Chrome Extension that would automatically convert block sizes from inches to mm on a Burl Source website (only in catalog section). I decided that it may be useful for some of KKF users, so if you are using Chrome browser you can try it.
Chrome web store link: Burl sources inches 2 millimeters
If it doesn't work for you or you need extension for firefox, wrote me a pm.
P.S. That's a nice Tiger Maple, Mark. Really nice!