The natural place to begin research on any of the great movie palaces is the:
Theatre Historical Society of America
York Theatre Building, 2nd floor
152 North York
Elmhurst, Illinois 60126-2806
Telephone (630) 782-1800
Fax (630) 782-1802
http://www.historictheatres.org/
The Theatre Historical Society's years of dedication to the appreciation and preservation of a unique American building type has linked them to just about every theatre buff in the world. They may even be able to assist you with your Catalina Island Casino query, as I recall that the casino was not the only entertainment structure designed and/or financed by Walter Weber and Summer Spaulding.
http://mailto:TGrunewald@QuadrigaArt.com
Theodore Grunewald
Chief Archivist
Quadriga Art, Inc.
Reproducta Co., Inc.
Executive Headquarters
30 East 33rd Street
New York, NY 10016
Phone: (212) 685-0751
Fax: (212) 889-6868