Simply, no. Shipping rates are flat and does not increase even if you pledge for 4 sets.
You will be able to set your shipping address after the campaign via Pledge Manager. We will post updates and help you through the process.
Yes, they will fit in the box.
Yes, all physical reward backers will receive the print and play file after the Campaign.
Yes, you will get everything in the set + the add-on tokens.
Don't see the answer to your question? Ask the project creator directly.