I'm building some built in bunk beds. Framed with 2x4, extended out from the walls to give the "built in" look. There is a set of beds going north-south and a similar set going east-west with stairs in between to reach the top bunks. The fronts and walls will all be extended from the exiting drywall to look "as one". My question is this: what material to use to case the project. It extends from ceiling to floor and will be sprayed a grayish-blue tinted lacquer. There is 10+ outside corners so drywall is giving me pause, plus I'm not terribly confident how a sprayed tinted lacquer would look on drywall. Using mdf or poplar/ply is fine but it requires some more fit and finish effort than hanging drywall. What say you?