I made one for each foot. I typically put a kick drum on the left and some sort of high frequency sound (snare/rim/hihat/scratch/etc) on the right.
Carved instead of flat. I made spaces for my heels to go, and the tactile feedback is really helpful for keeping centered on the board.
Grippy instead of smooth. I used a section of a non-slip rug pad.
Sorbothane instead of neoprene. The goal was to find a material that would absorb the impact from my foot instead of bouncing around.
Circles instead of triangles for the sorbothane. According to the manufacturer it dissapates energy better that way.
Flexible adhesive instread of epoxy. I used Loctite Ultra Gel Control, a flexible cyanoacrylate.
3/4" instead of 1/4" for the top. I think it's better if the wood isn't especially flexible.
Integrated toe rest instead of separate. No reason to have toe rests that can slide around independently. Looking back I really don't know why I put up with toe rests that kept running off.  I made the toes be pads as well but haven't used this for anything yet.
 Well, I do know why. I have a very string satisficing instinct. If things are at all tolerable, why change? Overall I think this leads to me being pretty happy.
And a series of diagrams showing how this works out in our hall:
While this looks like very tight timing when I'm describing it, the actual timing tends to feel pretty good.
At least a week before the dance, get in touch with the organizers about sound. You really don't want to show up and be missing something important. A good place to start is listing your musicians, what instruments they play, and what you need for amplifying each instrument. For example, with the Free Raisins I'd list:
Here's more or less what I said:
The web started off as just HTTP. This allowed for an enormous amount of things, but online shopping wasn't one of them. The problem was, sending credit card numbers over HTTP opened them up to theft: anyone between you and the server could keep a copy of your card information. Netscape saw this as an opportunity, if they could make a safe way to do this, using their browser and server. This would be good for them and good for the success of the web as a whole.
It was initially viewed as just a thing for credit cards. For example:
Netscape charges $1,495 for an entry-level server; adding the ability to handle secure credit card transmissions bumps the price up to $5,000
—The rise of Netscape, July 1995