Really fantastic work, as soon as I saw the video I ran out to grab an old chessboard from a 2nd hand store, whipped out some old minis, printed some new ones, and now I'm decorating the terrain with my son.
We noticed that the chessboard has a back side that is 10x10, so we want to try and play on the larger field too. We are also building some scenery like elevated stairs, trees and rocks (like yours) to add more diversity/constraints. We will come up with our fun set of rules for these additions.
Thank you so much for putting in the time and effort,I can see my son and I bonding a lot over this game :)
I do have one suggestion though. Would it be possible to get the printable cards in PDF format? with the jpeg I can't seem to find the right size so the prints match the size of classic magic/pokemon cards (for sleeving)