I need to know if the motor will be able to hold the weight of the camera tilting on the spec sheet it gives the holding torque at 39.2Nm but that doesn't really mean much to me so I'll just try it.. once I've got everything running I'll set about fabricating the head
If you can balance the camera so it's centre of gravity is inline with the rotation axis then the weight problem pretty much goes away. We use cameras weighing 5Kg or more being panned/tilted by a small 12V DC motors about half the size of a 330ml cola can.
EDIT: I found an image of the above device, as you can see I have highlighted the 12V pan & tilt motors. They are geared with just 2 cogs (motor shaft to camera platform shaft) and can pan/tilt a camera weighing upto 22.6kg