mounting the electronics

[greencactus3]

a couple questions from a rookie team..

is it really BETTER to have them mounted on a non insulating surface?
is it better to have them mounted on a board that is easily deattachable from the robot?
is using velcro to mount each individual component a good idea?
is it not a good idea to mount them to our frame directly using velcro?(our frame is aluminum)
how easily accessible should they be?
is it a bad idea to need to flip the robot over to take out the battery?
has there been any accidents that you know of where any part excluding the motors and fuses had to be replaced completely due to any reason other than physical disturbances?
how what gets HOT? the motors..... the victors? well they already have fans on them...

well anyways, please tell us what is BAD. and what we need to worry about or what we need to be careful of or what has to be however (other than whats on the manual)

just don't want to do anything wrong! thanks!