Your video convinced me to buy some rollers! (I especially like the bumpers to keep your front wheel from going off the edge.) They're in the mail, as are the roller blade wheels... the only thing that possibly looks difficult is attaching the wheels to the frame. Did you need any special hardware for that, like spacers and axles, or did you just use bolts through the bearings? The other thing I'm wondering about is whether it would be possible to make the bungies go under the rollers to make it more compact. Thanks.