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No problem, always like to contribute to the forum things I think others may find of some interest, so glad you found it useful
PM me your email and I can send you a full rez file
As for the weight, about 8oz or so, its a fairly solid hunk of metal and glass, and you do feel a change in balance of the camera a little bit, but nothing too bad. I have a grip on mine so it didn't really bother me.
Threads of the GW3 and the RX1 both are metal as well so I don't think there is much risk for wear/tear assuming you are careful taking it on/off. I worried a little about the weight on the lens barrel but that seems quite solid with no wobble or anything. May not have been designed for more weight than a filter on there though so use due caution, maybe not the best idea to walk around it all day etc, who knows really.
As for the GW2, I doubt it would work as it was made for a much smaller p&s style sensor. I'm frankly amazed the image circle is big enough for 35mm FF