thanks for the replies guys,
Most of the possible problems are not an issue as i smoke indoors and keep the machine fully dismantled and well cleaned in between smokes.
but the problems look to be arising from the jobs im putting it though as i do indeed use a hell of alot more bisquettes as i smoke around 8-10 hours solid, i have countered this problem by using a large tray and opening the door every two hours or so to ensure the spent bisquettes are moved about.
The next problem will be that i keep the vent fully shut for the full time, thanks to KyNola for bringing this one up, I was doing so as i was putting 4-6 1.5kg pork shoulders in at a time and trying to keep as much smoke in as possible for maximum flavour. this coupled with my fear of drying out the pork meant i opted to leave it shut and see what happened, with such a good pork as a result it never crossed my mind that this would have been a problem.
after a bit more research im going to get the cold smoke adaptor and use it to hot smoke food, meaning i can keep the closed vent to keep the moisture in the machine and not worry about causing myself problems with the moisture getting to the bisquettes (as this was causing some mess) and i cn easily tend to the water bowl and spent wood without losing too much of the heat and smoke from the main unit.
if I had the time i would love to get something like this sorted
http://forum.bradleysmoker.com/index.php?topic=31509.0but for now getting a cold smoke adaptor and keeping the generator separate to try and keep it in the best condition i can
But I will be taking into account all your comments,
thanks very much for your help guys

JP