Tamiya makes (or made) a 1:35 scale model of the British Mk 4 WW1 tank. One of three versions incorporated radio control and two motors. I bought one and had constant problems with the r/c equipment. The transmitter died and it took months for Tamiya to replace it. later, either the second transmitter or the main function board died. it ended up on a shelf in a static diorama.
I have been using Heng Long's 1:30 r/c tanks as a resource to animate a number of 1:16 scale small tank models - Takom's PzKpfw 1A, 1B, 1 Breda and Renault FT. I've taken the motor/gearboxes, the main board, lights, speaker and lipo battery as appropriate. Heng Long makes a Sherman and a Pershing in this scale.
On a quiet day it occurred to me that the electronics would probably fit in the Mk 4. In short order, I resurrected the tank, which also enabled a sound function. Of course, the sound is not "accurate", but it is better than silence! If anyone out there has the same tank and it's inoperable, $50 will make it run.
WW1 Mk 4 Tank
WW1 Mk 4 Tank
Renault FT, British WW1 Mk. 4), Pz 1A DAK, 1B, II L, III, StuG III, PzKpfw IV, StuG IV, King Tiger, T-34/76, KV-1E, T-35A 3DP, Zik-2, T-90, M3 Lee, M4 Sherman, M26 Pershing, M41 Bulldog, M1 Abrams. In the works: Ram II, Pz 1 Breda. 

- Kaczor
- Warrant Officer 1st Class
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Re: WW1 Mk 4 Tank
Great! I hope someday Tamiya will resize it to 1/16 like they rescale 1/25 Centurion 

Re: WW1 Mk 4 Tank
Hooben is advertising this on Facebook:
Renault FT, British WW1 Mk. 4), Pz 1A DAK, 1B, II L, III, StuG III, PzKpfw IV, StuG IV, King Tiger, T-34/76, KV-1E, T-35A 3DP, Zik-2, T-90, M3 Lee, M4 Sherman, M26 Pershing, M41 Bulldog, M1 Abrams. In the works: Ram II, Pz 1 Breda. 

- stu_the_flat
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Re: WW1 Mk 4 Tank
I have the single motor version of this... your paint job looks way better than mine!