You can add funds now or wait until the end of the campaign. During the pledge manager at the end of the campaign you'll be able to get anything you want!
Yes. All the maps in the book come pre printed with a fine 1inch grid on every page.
Both options will be available at the end of the campaign. Digital maps with and without grids.
The only difference is the early bird backers have discounted shipping!
Yes, but be aware the shipping is estimated on kickstarter and will be more expensive during the pledge manager depending on where you are located.
Don't see the answer to your question? Ask the project creator directly.