I think a nice plot with a small headstone would be a better testament to their faith then this sideshow attraction.
I visited a cemetary in Geneva, Switzerland back in the 80's. Massive headstones, ornated burial sites everywhere.
In the midst of this was John Calvin's grave. A simple 3'x7' covered with ivy. The marker was a simple stone with J.C. carved in it.
Pride (and fund raising) goes before a fall.