We have 14 stations of the cross within stone and the plexiglass needs to be removed in order for it to be replaced. We think that if a mason is able to remove the right stones, it will be possible to replace the plexiglass without jeopardizing the integrity of the structure. Please email kbailey@sarcenter.com for more information or call 715-443-2236 Ext 124 for more information.