Alas, We're not running a swerve drive this year, (though i should do one, it would be fun) nor do we have a 6 motor DT. With a two speed shifting gearbox we don't think we need the power and we certainly don't want the weight. These gearboxes are for our 6 wheel WCD, two for competition bot, two for practice bot, and two spares/display.
As far as your guesses go, yes the square holes are for t-nuts that hold the plates together.
The circular cutout is indeed for a fan, inspred by 971's gearbox, we don't know if we'll be running fans though, might not have the room
but we are looking into heat sinks instead.
And yes the mounting for the cims is slotted to facilitate the tensioning of 3mm GT2 belts.
Sam: I don't know what you're talking about, these guys have the smallest footprint of any of our gearbox I know of.
Concerning the sheet metal plates, about half of what you see here was made by a sponsor, the other half was made in house by students on our CNC. This year we're striving to make as much of the robot student made as possible, to that extent we're currently working on rolling out student made versions for the rest of the plates. Some of the students made a press break to fit on our hydraulic press. They have a depth readout on it and have developed, through testing, an equation to precision bend the plates we make in house. Hopefully by our first regional we'll be running complete sets of student made gearboxes.