The motor mount has been adjusted, meaning it will only fit 5 inch propeller. You can find the parts list in the description of the video.
Here's a video of me building and driving the airboat: https://youtu.be/A5SU8Zp4zPE
This airboat was specifically designed for the CR-10. You DO NOT need any supports! I printed with a 0.5mm nozzle at 0.3mm layer height = 40 hours of printing.
I recommend printing at a higher temperature than normal to increase bond strength.