Hello Lathe Ladies, Mitre Mates, and Plywood Pals!

I've been tracking my kids' heights on a wall for several years but I'd like a prettier solution. Something I can screw on the wall and mark their heights on (maybe temporarily and then go back with a wood burner or something). Ideally, sometime that's two identical adjacent pieces that I can give them if I'm ever lucky enough to be a grandparent.

A straight 7' board with a cutout for the moulding and burnt or painted 6" increments is the simplest solution, but can y'all think of anything nicer? I would prefer to keep it on a semi visible wall instead of the laundry closet.

Thanks friends.