Frank, to be honest i think thats pushing it to much over its limit. The Mount can handle 60-70lb for visual use. 1/2 to 2/3 of that for Imaging use is reccomended. I would say a Losmandy Titan mount might be better bet than a the G11. Ther is a nice big Samson/Goliath (made in Aus by Astro Optical) like mount for sale in Clasfieds section that would carry it.
Here is the one for sale.
http://www.iceinspace.com.au/forum/s...ad.php?t=45091
Another option is on of the older Anssen mounts are made in australia would also do the job. The older Ansen mounts come up from time to time and might be cheaper than buying a Titan.