The Cathedral of Troyes is renowned for its glass as may be seen from the images of the stained glass windows above. Perhaps this is the reasoning behind the rather unusual tabernacle in the Blessed Sacrament Chapel off the south aisle seen in the bottom photo. Just above that may be seen the glass case displaying the model and drawings for the proposed new altar. The proposed design appears to involve a basic stone structure with a free "floating" mensa of clear glass through which the "sepulchre" or container holding the relics may be seen.
It is a- perhaps- novel idea which , nevertheless highlights the place of the relics in the altar. Given the tendecy of dispensing with relics altogether these days this cannot be altogether bad.