do you know what, i didnt mainly cos i was against the clock doing it. but it isnt hard to do.
bought a 2m lenght of 68mm drainpipe. a couple of 90degree bends. a saright coupler, a 45degree bend. some sealer and a jubilee clip.
only thing with the idea is you will have to make a guard of some kind to protect it from being smashed by the trees in the tighter lanes. which i also made. all is good. actually went laning last night to which after a few checks and adjustments it survived a deep water crossing