The "Elmod" Board is a straight swap except for a little bit of soldering to connect the speaker, You will need a new speaker,
Maplin sell a beauty for under £10 including postage.,It is just 20mm x 40mm its code number is N24KJ,
Go to "U TUBE" ,
Type in WSN/TORRO M16 and there is a very nice visual explanation for the "Elmod" fit and other tips on modding this Half track.
The "Elmod" Board changes the M16 into a very impressive bit of kit indeed,
The "Elmod" Control board including postage cost 170 Euros from ---
http://www.elmod.eu
Shaun.