The the platter is part of the motor, think armature I guess. I paid $71 for it at auction, I suck at auctions. It was local pickup though. It's actually in very good shape, not even a lot of dust and I'm sure I was the first one to have it open for awhile if ever.
The speed control was touchy till I cleaned the pots, now it's spot on. There's a warning about contamination of the magnet, mine is as goos as the day it was new from the looks of it.
The platter is in fact a bit on the light side, pretty sure the one on my MCS is a bit heavier, however, the drive system, as advertised would preclude the need for a massive flywheel type platter, and it does work well. On the other hand, I believe as a result of it's lack of mass, it's a bit prone to feedback.
The two other weaknesses I noticed in the design are the use of 1/2" particle board for the top half of the plinth and plastic for the bottom half, both again leading to the feedback problem, along with the fact that the panel the tone arm is mounted on is plastic and picks up vibration easily as well.
In fact that's the only real complaint I have, it howls if you're not careful, but placement isn't ideal yet either so it's an annoyance, not a problem.