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In matching scopes to mounts, I have tried to maintain a total weight that does not exceed 2/3 of the rated capacity of the mount. There's no science to this, just a rule of prudence I have applied in the past. With high-end mounts, you could probably go higher but my belief is that you stress the system in many ways that are not immediately apparent.
So, I add my voice to those of others here and say don't go down the HEQ5 route if this is your scope of choice.
I would add that a visual scope, like your dob, may not be well suited to imaging. The position of the focuser is designed to match the visual user. An imager would very likely want more backfocus to accommodate a MPCC and camera. This means you may well struggle to bring a camera to focus without making some serious adjustments to either the position of the primary (i.e. pushing it a bit further up the tube), or the focuser.
Peter
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