Couple of book bugs in the manual.
Page 1 might be good to print boldly 20M.
Page 4 Atmega348 in board layout view, should be Atmega328.
Page 23 D9 in the schematic is D2 on the board.
Notes so far... Tiny, I am a fan of that.
Thanks for mechanical layouts, very few kits come with those and I do appreciate that for the drillin
and blastin part ( case making).