Dragon.....I have a question how do you secure the cells to the chassis if there is no slots.....I mean wont the pack just come sliding out with out any slots? And you can get away with using 2mm graphite and cutting out the slots and keeping it stiff by using a better grade graphite.....but this cost more money so thats why there is 3mm chassis' to get the stiffness of higher grade stuff with less cost. This is a nice idea that you have but Im kinda leary of mounting my motor 6mm off the motor mount on a spacer.....hopefully it works and stays straight.