For my room i was thinking to make colums and mount wall sconces on them. place posters in between lighted by overhead potlights located in a bulk head above. My question is what is the best way to construct the colums? depth and width? and should they be filled with insulation? would you fill the bulk head with insulation also ? Also anyone have a good source for the sconces? i have noticed they can get pretty expensive. thanks in advance Paul.