Came across this company recently. They specialize in complex rigging for museum installations. Looks like they can handle all manner of scenic and artifact / art based projects. Could be a key vendor for the right project.
From the installation of a large gallery or museum collection to the installation of a single, signature artwork in a lobby or plaza, Methods & Materials, Inc. has the expertise, experience and professionalism necessary to oversee all aspects of your installation – from communication with artists and architects to specification and fabrication of the installation hardware. Once the pieces are permanently installed, Methods & Materials, Inc. can provide the ongoing care that your collection deserves.