Have you heard of or are you familiar with Virtus VR for the Mac.  It allows
you to set up a virtual world (up to a mile square) and then "fly" through
it.  The basic module costs $65 and the "archaeology" add-on costs $29.  Any
idea who might have some experience with it?  It sounds awfully inexpensive
to be of much use.
 
Tom Wheaton