Updated Building a Yacht!! a basic framework by Ralphael (Expanded version)

Thank you Ralphael but now im stuck on step 5. Part 2 my problem is getting the bottom of the hull underwater. are you supposed to use the lower terrain tool under the ship or the pond tool. If neither then what do i need to do because Im stuck and I read the step but I still don't get what Im supposed to do.

Also how do you get more than four floors

but aside from that i did get it completed but it was tacky and only 8 squares wide this time im doing it again but at 22 squares this time