These are two of my large-scale motorized R/C boats fitted with Lego parts. They had their own factory features on their own, but I added more by scratch-building some out of Lego parts.
About this creation
In my collection of Lego boat mocs, I also have my large collection of large-scale R/C boats. A few of them are scale-based, like these two shown. They had factory details on their own, but I decided to add a few more by making them on my own by using Lego parts. On each vessel I added fitting features like dinghies/lifeboats, crew, radar, antennas, flags, etc. Shown here is the wheelhouse roof on my largest boat, my Aquacraft Rescue 17 Electric Fireboat. I used a flagpole/antenna and made a radar dish. All of the small details like these are held on using hobby-grade CA glue. Boat specifications: http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXFBBF&P=0 here's a promotional video of it: https://www.youtube.com/watch?time_continue=2&v=hRimLKC3grI
Here is one of the main features. I added my own minifigures to the top deck, and they hold on literally by holding onto the guard rail. In the middle of the top deck is a fuse box with a flag on top and a small marine light.
Here is my favorite feature. I scratch-built 2 dinghies with outboard motors and mounted them on the stern deck. (They are also the hatch door handles to get to the boat's water pump and rudder servo housing)
The water I run my boats in is sometimes rough and corrosive, so I had to make a heavy-duty and waterproof way to attach the dinghies to the stern deck. I used heavy-duty Velcro and attached the loop side to the keel on both of the dinghies and then added the loop side the the deck itself. It is very sturdy but the boats should not be removed. It is also a plus that lego bricks are made of ABS styrene plastic, which will not corrode or contract calcium deposits!
Entire view of the stern with the crew & dinghies. As you can see, I made my own "BEWARE OF PROPELLER" sign with a label maker. It gives a 3D effect and has a stamped-steel look. I also did this at the stern and made the vessel's home base name, "SAN FRANCISCO, CA." The crew look over at the stern and port and starboard sides to get a full view.
As of right now the Rescue 17 is in drydock, so we might as well do some inspection. Here we have an engineer inspecting the water intake, pump intake, propeller and rudder. The oil and stuff leaking out of the propeller shaft is only Corrosion-X and outboard motor grease. If you have seen some of my other models, I may mention that Corrosion-X (A potent lubricant and corrosion inhibitor) is inside the motors.
Here is my 2nd scale boat, my Aquacraft Atlantic II Harbor Tugboat. I only added a crew.
More inspection! Here I have a mechanic and engineer inspecting the propeller and rudder.