We built a very fine topo map using USGS digital data and a CNC router run
by a custom computer program. If CA has topo information available
digitally, we might be able to subcontract for it with you. We are a
non-profit and make our own exhibits. Our topo map is of CT and it is 20'
by 15' (that's right, feet). It is strikingly precise and we project many
different layers of information on it. It is a showstopper, but it ain't
cheap.