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For the tender I have made an oil bunker to fit over the gas tank thus resembling an oil burning locomotive.There should be no reason why you couldn't put a bottom on it and put the batteries and receiver in there.
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Oil bunkers generally rose a good ways above the tender tank's top deck, and the Rx and batteries could sit above the gas tank in the bunker.
 
I never completely cover the tank with water on any of my locos. Your idea of making the tub removable is a good one though so you can empty out the water at the end of running. Is your bunker removable? Why not just screw a thin sheet of brass or styrene to the underside? You could even mount a small on/off switch (if the styrene is thin enough a standard R/C slide switch would work) to protrude out the front of the bunker, or out the underside to keep it completely hidden.
 
Here's a few photos of such a tub I made years ago for my C-21...

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The size of the receiver and the length of the antenna shows how old this installation is - my guess around 2002 or thereabouts. This was an old Futaba PCM radio using the conventional FM band, waaaaaaay before 2GHz hit the shelves.

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As you can see, the fueling boss protrudes up through the central hole (the raised edged keep any water from sloshing into the tub).

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The whole thing was hidden by the coal load with just the leads to the cab-mounted servos sticking out. I sold this locomotive, radio and all, many years ago. I still see her every year at the NSS. I believe the radio installation hasn't changed much, though Craig (the current owner) may have switch to a 2 GHz unit.

Hope this is helpful.
 
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