As for a water proof servo, I don't know if anybody makes one. If you have built the boat correctly you shouldn't need one. I have one boat that has a 1/2" of freeboard to the main deck. All of the electroncs and hardware are below the waterline. I have yet to see a drop of water insde the hull.

I have become a fan of the Proboat speed controls since High Tech stopped selling their 610 model. You can't beat the price of $40 for a waterproof electronic speed control with reverse. If you want to go high tech, I like Vantec, they are pricey though. I would stay away from the old Dumas mechanical speed control, they can generate a fair amount of heat when used for a long time and are prone to failing.

Gel cells are a great way to go, last a long time and make great ballast weight. You can't be in a hurry to charge them up though, overnight is the way to do it. The 6 volt 5 amp ones are a perfect size and can be found at Home Depot or Lowes with the emergency exit lights. I will admit this though, due to the amount of batteries/boats that I have, buying that many chargers would have been expensive. When buisnesses remodel, they throw away the old emergency exit signs. I get a hold of them and remove the charger circuit boards. I have built a charger box where I can charge up to 12 batteries at once.

Now how about them pictures.