No, I'm thinking of mounting it on the left side cover, or maybe on the little bracket just above the left side of the frame, under the seat where the fuses used to live... would need to make a slightly bigger bracket to accommodate the switch.
Here's the switch I picked up:

Stay safe with this on/off safety switch. This SPST toggle switch includes a safety cover to prevent untimely switching. Rated 20A at 12VDC.
* Ideal for computer equipment
* 3-prong SPST ????? not too sure here. Well, I know how to use a multimeter!