Well these are Grandpas' boats😁. My oldest Grandson is just at the age where he can operate the transmitter. I charge the batteries, connect and put in the water, he only does the fun part.🚤 My younger Grandson is only able to watch along with Mom and Grandma. 😉
Let me add that I don't use excessive current when charging them, and stay with the charger at all times.
While these batteries have had some "accidents" I feel that if constructed correctly and handled in a responsible manner, it is safe to use by responsible people. I carry one in my pocket all day long via my cell phone.😊
You also mentioned the motor mount. These are home-brew aluminium cut sheet based on a plan I believe I got from the Marine Craft website? I do plan to install brushless motors in these two boats, will probably have to modify or remake the mounts. Although looking at my picture, it is from a previous installation of a smaller DC motor which was wedged in with balsa wood. Newer motors had much more torque, so I had to physically mount in the motor mount.
I will do a build blog when I change out to the brushless motors.