no probs dave, just a couple hints m8
first of all i would replace the spring on the brake rod, teh brakes are not very good, replace it with a short peice of fuel line, gives a much better control. secondly i would remove all servo`s and put a layer of insulating tape around the seam of teh servo`s where the two halves join, this will prevent a lot of water getting in .
and i would highly recomend a 6v hump pack nicad for the sevo`s. very well spenty and should last a good 4-5 hours .
other than that , just aim to get it as dirty as possible
lookin forward to seeing some pics
ADZ..