Hey man, I am in westford too, A couple of friends and I are looking into places to ski this season, other then Nashoba, because its too expensive for what it is worth.
We were looking at the area around the new stony brook school, since it was built in the sand pit, it has a nice slope over to the right, (If comming in from the entrance)
About the compressor, My grandfather made a compressor a couple of years ago, and just recently bought a new one. His old one used a cyclinder pump from an old Cadillac air conditioning system, It produced 100psi great, but thats all he wanted to put into the tank, which was a water tank.
So I could probably hook that up again real cheap.
I have added you to my buddy list, my name is 'GNR Racer'