I wouldn't be caught dead with my main panel outside. You really want
to go flip a breaker on a rainy night? For that matter, having them
accesable to any slob in a smelly tshirt wandering the streets?
I don't think so...... I know there are people who have their breaker
boxes outside.... I'm just sayin I wouldn't even begin to consider it.
Other than that the price seems right. Keeping in mind I don't do this
kind of work - but replacing a panel is no small task. Adding in the
cost of the trench, and materials...... to me it actually sounds a bit
of a low bid.