Hey Tom,
Just a little FYI, ole Elvis did sing a lot of gospel music so depending on the selection, and geographic location of said church, the congregation may not necessarily be upset.
As for trigger guards on other-than ALR's, I have seen many different styles, some made from a separate piece of wood which may or may not be the same as the stock wood, some with full/partial metal reinforcement, some without metal and some carved right into the stock blank (all one piece of wood). As with anything else, to maintain HC/PC would require a lot of research as a lot changes depending on geographic location.
As for messing with other-than natural materials ... yes, it can be done and sometimes to the point where it'll fool most people but one must also consider the cost verses the costs ... real ivory inlay may cost less in time and materials than manufacturing a suitable synthetic facsimile, in other cases large enough pieces of real ivory may not be available and therefore the material and labor costs to manufacture synthetic may become cost effective or the only alternative.
About the aluminum pyramid atop the Washington Monument.
Aluminum was not the first choice for the pyramid, nor did the choice involve any material design evaluation, extensive tests, or lengthy comparative competition among available materials. Instead, aluminum was selected as an alternative material during discussions between the engineer in charge of the project, Colonel Thomas Lincoln Casey US Army Corps of Engineers, and William Frishmuth, Frishmuth's foundry Philadelphia PA, the only U.S. aluminum producer at that time. Casey requested Frishmuth make a metal pyramid out of copper, bronze, or brass, plated with platinum so as not to tarnish and to serve as the lightning rod. Frishmuth suggested aluminum offering a quote of $75 but allowed for an alternative aluminum-bronze alloy plated with gold at a quote of $50 just in case he could not get a perfect casting of aluminum. On November 12, 1884 Frishmuth telegrammed Casey advising the aluminum pyramid had been completed with South Carolina Corundum. The final cost was billed at $256.10, an auditor was dispatched resulting in the final price of $225.00 The 3,300 pound solid marble capstone and 100 ounce inscribed aluminum pyramid 5.6" at the base and 8.9" tall were set on December 6, 1884.
Inscriptions on aluminum pyramid
East face: Laus Deo (Latin: Praise be to God)
North face:
Joint Commission at Setting of Capstone
Chester A. Arthur
W. W. Corcoran
Chairman M. E. Bell
Edward Clark
John Newton
Act of August 2, 1876
West face:
Corner Stone Laid on Bed of Foundation
July 4, 1848
First Stone at Height of 152 feet laid
August 7, 1880
Capstone set December 6, 1884
South face:
Chief Engineer and Architect,
Thos. Lincoln Casey,
Colonel, Corps of Engineers
Assistants:
George W. Davis,
Captain, 14th Infantry
Bernard R. Green,
Civil Engineer
Master Mechanic
P. H. McLaughlin