d20 Wound and Experience Tracker

I was after a simple, yet elegant solution for holding two 20-sided dice, to mark wounds and experience for the board game Gloomhaven.

I intended to design something of my own, but found Jambro's "Large D20 Holder", which fit the bill nicely. I edited the "top" file in Sketchup Make, and resized it to suit the majority of d20s in my personal collection.

Now I can use d20s, and don't have to worry too much about an errant bump changing the values.

I'm sure others can improve on this des