"It was a fun experience to build this fantastic model. But most the fun was distroyed when I turned on the switch. It was well at the beginning, but when the upper platform turn over half round, the whole platform was blocked by something. So I took apart the whole model and find that the single wheel under the platform was block by the tail of the base. I've upload some picture. the wheel is too close to the tail of the base. When all the weight turned to the rare, the upper part would be blocked Although there is a problem, but this design is amazing. I love it so much and maybe, I'll prepare to buy my second one."