pic: How's this?

[androb4]

Sorry for not posting any info.. It was getting late.

All the aluminum is 1/8" thick, 6061 T-6
The 8" FIRST shell is sitting on a 1/2" keyed shaft with AM hubs
That is spun by 2 Fisherprice 9015 on Banebots P60's 4:1
The shaft is supported buy the two inside pieces of C channel extrusion with bearings set in the wall.
Next is a shaft coupler to attatch it to the P60's, which are mounted between the walls of another C channel extrusion.
The ball compression is about 1.5"-2"
The camera mount IS 1/8" sheet metal.

This is my first time using sheet metal like this so I'm not sure about the best thickness to use.

Yes the disk is used for a tachometer. There is a Rockwell Automation Photo sensor under the left P60.

The hood is made of the AM hex tube from the chassis kit, space about 1"

ONE thing I need help with is, riveting. What size whole and what rivets should I use for the camera mount? Any suggestions? Also for attaching the sides of the hood the the square tubing on the outside.