Looking good, Peter!
I find myself wondering whether I can legitimately call something like that half of a 12/4 by 10 inch board (about 4 feet long, or 75mm x 250mm x 1.3m) of ash I have “left over” from my fancy laundry hamper (which I need to finish one of these days) would count as an offcut, since I was required to buy the entire 10ft (3m) length at the lumber yard.
In any case, it’s a fun challenge you’ve set yourself, and you get to build more toys!