Thanks very much Andy, very very helpful, Ive got the limit switches to try and sort tonight as well, im trying to run them as far away from the power cables as poss, but in some areas they will be very close especially the limit and power cables on the z-axis. Will have to see how I get on. Buying some MDF this weekend to make a sturdy table top and enclosure with a blow/extraction system, once thats done i can route the cables properly, when the cables come in close contact with each other I will try and think of some sort of extra shielding to help reduce interference (if thats the correct word).
Cheers for the positive comments :-) Helps keep my chin up with the build.