If your going to be imaging then you have to work the imaging capacity of the HEQ5, which really is probably around 12kg max. The manufacturers listed capacity sometimes is broken down into suggested imaging and visual limits. The published figures for the HEQ5 at 15kg is the visual capacity.
The GSO (aka Bintel) 8" f5 weight is listed as 12.2kg. Once you add in the camera, a guide scope, adaptors, etc your going to push up the weight by probably another 1 kg for all of that. So it looks like the that scope will be a possible imaging match for the HEQ5 but keep the attachment/accessories weight down for best performance.
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