DO NOT HAVE AN ELECTRICIANS DO THIS. Installing low voltage network cable is a very different discipline. Granted, some electricians are skilled at both while others will install network cabling just like they install romex.

Also, the most difficult part running network cable will be patching holes in drywall which most electricians won't do either.

How does your observatory control work? Is it using proprietary analog signals on that Cat6 cable, is it using RS-232 serial, is it running IP, is it using a non-IP protocol but still ethernet?