Step 1: Go get stuff
(x3) Scrubber brushes
(x3) Adjustable tracks
(x2) Computer fans (of the same size)
(x1) 9V battery connector
(x1) 9V battery
(x6) 1-1/2" bolts
(x18) nuts for 1-1/2" bolts
(x6) 1/2" bolts and nuts
(x1) a bunch of small zip ties
Step 2: Drill holes
You can use the ends of the track as a drilling guide.
Step 3: Attach the track
Insert one or two nuts to space the track off of the scrubber brush in such a way that the middle slider can move freely.
Insert the bolts into the hole on the scrubber brush and fasten it on with another nut.
Step 4: Mark for drilling
These marks should be made in such a way that it splits the frisbee into even thirds.
Step 6: Fasten
The brushes should now be acting to create a tripod to support the frisbee.
Step 7: Vibrating motors
You should try to avoid making them evenly symmetrical by cutting off the fan blades in a different pattern on each fan. This will give it a little bit more of a unique mobility.
Step 8: Zip tie
Also, you may want to consider connecting them together in such a way that the wiring on each motor, is roughly across from each other.
If done right, the 9V battery should be held firmly in place and the motors should spin freely.
Trim off any excess zip tie bits when you are done.
Step 9: Wire it up
You may want to solder them and cover them with electrical tape for a more reliable connection.
Step 10: Drill more holes
Use your fan assembly as a guide for drilling the holes.