Blueprints and manuals occupy the barn's other heated space. Volunteer assistant Chris Gibson brings a missing piece of the radio-room floor — Rib B5, to be precise — to Mike's attention. After searching the shop and scrolling through a photo inventory, they determine that they never had the part in the first place. Chris also is a modeler. "A lot of our best guys are modelers," Mike says. "Most of the guys here are not airplane people. They were modelers who just wanted to help out. But they have the coordination to make stuff and take stuff apart."