Hello everyone, My Venator was finished a few months ago without using magnets to attach the bottom hull pieces. The first set of holders was stolen influenced from Jeff McClain's build shown earlier in this thread. They attach to the bottom plate and then the keel in the center. There are two pairs for each hull plate (four total). (Click to see larger versions of the pictures) The other holders are made from five elements including a 2X2 turntable. The turntable allows the holder to pivot to attach to the hull plate and then to the technic frame. They can also be rotated around the technic pin with axle to pull the hull closer to the frame. There are three of these attached to outer edge of the frame on each side (six total). The holders keep the hull very stable with no movement when the ship has been moved. They can also be placed in several places to keep the hull from sagging. Hope this helps any of you contemplating building this fantastic MOC. They are a very cheap alternative to the magnet holders.