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Its possible - but its right at the limit of what a CG5 can do - plus the Celestron dovetail that mates to the CG5 is a weak link when you're going for stability of your rig.
My advice would be get a light ed80 and mount it on top of the C9.25. I love the Carbon fibre C9.25 as it keeps focus beautifully even with significant temperature changes,
I put my CG-5 on a pier, used a CGE bar to on the top to attach O rings to hold a (too heavy) Megrez 80mm. Ran an 3" extender to achieve focus into a Meade DSI -> PHD -> ShoeString Astronomy parallel port -> 6 pin cable -> CG-5 auto-guide port. It worked and kept costs low. I imaged from a Canon 400D on Manual Bulb mode driven via a ShoeString adapter into a PC via DSLR Shutter software from stark-labs.
This set-up will work, but it needs care and it right at the limits of the gear's performance.
I added a Meade motorfocuser, then switch to a second hand Vixen Atlux (pure magic), then added Losmandy dovetail bars (greatly improved rigidity) and now am playing with software to better tune my rig!
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