Mounting the 6.5 horsepower Harbor Freight engine to the top of the robot produced a lot of vibration and made it extremely difficult to remove the engine. Therefore, I decided to make a separate motor mount that could be detached with 4 5/16in bolts. Below are videos documenting the build process as well as pictures (through the link). Feel free to copy the design but do so only at your own risk!. Happy Building!