The main game comes in a 30x30cm (11.8'x11.8) box and the board is 25x25cm (9.8'x9.8').
The wooden edition comes in a 32x32cm (12.5' x 12.5') box and the board takes 30x30cm (11.8' x 11.8') on it.
Yes, you can add copies in the pledge manager!
Additional copies will cost around £ 2-£ 5 depending on your location.
Yes, you can upgrade your pledge from the £1 to the standard or deluxe pledge or from the standard to the deluxe.
Don't see the answer to your question? Ask the project creator directly.