Frankie here, enjoy some explanations of recent design changes!
Bar base-
Rather than continuing with a full box/board as the base, we have now shifted to a less bulky design. The base is only a standing bar that goes under the plate, housing the electronics and providing the structure for the gantry above. This makes the whole thing lighter, less awkward to move and allows access to much more of the bottom of the plate, for use in position sensing.

Encoder and  Limit Switch Under-
Instead of placing the optical encoding ring and limit switch on the top or side of the plate, they are now underneath, creating a slicker design as they are out of sight and, a larger plate, as they don't take up any drawing space. Also they are now closer to the breadboard, for easier and cleaner wiring.

Little Wheel (Side Driver & Spring)-
A little sense was driven home the first time the plate was spun at full speed, and it became obvious the solenoids would not be able to keep up. Since then we have reduced the speed twice: first with the relocation of the driving motor to a smaller side wheel, and second with the 1/2 reduction of the side wheel. Though this has drastically improved our speed challenge, with the introduction of the side wheel came the some new problems, namely maintaining constant pressure/contact between the two. Quickly though, this issue too was resolved with the addition of a clever spring that pulls the side driver against the plate.

Proto Board- We discovered that the breadboard is not rated for high enough current draw, so we are now using a smaller protoboard, also more permanent thought less easily iterated upon.