Jim,
1- yes, but all my pervious predator problems have been through the wire(or aireal raids). Next trip to Home Desperate I had planned to pick up 2 sheets of 1/2" OSB. I'll lay them down & set the coop on top...should take care of the digging threat.
2-yes, snow could short it and we are on a big creek so the coop site can see a foot of water during floods. Some day I need to bring in some gravel to build it up a little.
I am also going to grab a 5 gallon deer feeder with a digital timer & hang it in the yard. That way we can actually go on vacation without bothering the neighbors.