Tool Purchase Regrets, Most Useful Tool, CAD Software

<p>Brian's Questions:</p> <p>Hey guys,<br>  <br> First of all, thanks for the most helpful woodworking podcast around! My question(s) revolve around a home library project. I’m planning on bookcases on all four walls of a small room and wondering how you’d approach that, specifically:<br>   (1) what would you do about the inside corners of the room where two sets of bookcases come together? Just blank them off? Something else?<br>  (2) as far as the cases themselves, for cost reasons, I’m planning to do 3/4 plywood carcasses close to 8’ high with one fixed shelf in the middle...