To my knowlege on the site they post ready to shoot packages for the scopes listed and for the cannon cameras, Canon Elph 100HS and a Canon EPLH 110 or video cameras. I emailed Reggie Parsons when I got one for my Razor HD 85mm a while back at [email protected] and he was most helpful getting something to me custom that was not listed on their store site. Depending how the Powershot SX IS size and your Swaro 65mm spotter, I'd gather you would need to epoxy a ring step up adaptor on to the camera you have but I'm not positive.
You will need some way to adapt your camera to accept 37mm or 58mm threaded accessories. Your camera is not optimal for digiscoping with its 10x zoom. You would be better served buying an inexpensive 4x or 5x compact camera, a Zeikos universal 37mm adapter, and the appropriate Tines Up adapter.
You can see my setup in the following article and companion video: