I bought the SEX amp from Doc and it already had the goldpoints installed. So, for me anyway, it was a piece of cake. From the looks of it, there seems to be plenty of room. I think I have a picture of the underside that Dock took of it. If I can find it I will attach.
I did install goldpoints on my FPIII and it was no problem. I probably didn't give it a fair before/after listen to know exactly how the sound improved. I think they sound really nice and more than anything, I love the feel of the things. They just feel well made, solid and in control.
I also installed a Khozmo (
www.khozmo.com) in my Crack amp. This thing is really huge and heavy. I had to dremel part of the side of the base to get it all to fit together. Price is about the same as the goldpoints but these are 44-step machines that are all business. You will have to be patient, though. They ship from Poland and it takes a little while.