>>7589099I had the same question myself way back when, so the first thing I did when getting one was find out. In it's stock configuration it cannot be made into The Hollow or a Caliber Dome. Both builds contain one "wrong" connection. However vinyl is easy to work with and I made the hollow happen with a simple fix, an armodoc canon piece. Caliber done would be more difficult to figure out because the dome piece is changed to include a giant vinyl "switchpin" which while *super* useful contains 3 of the 4 possible connection types but not the one we'd need to complete the build.