Q: Thanks for your assistance in the past. Today’s question is “Where do I find information about the setup, placement, etc., of the repository for Holy Thursday?”
A: The missal just calls it “a place of repose prepared in a part of the church or in a chapel suitably decorated” (Holy Thursday, no. 38).
Beyond that, there isn’t much. You find general advice on the liturgical year and seasonal decorations in Built of Living Stones 122-129, which may give you some ideas to apply.