don't be put off too much by those discussions.
The EQ6 holds my 300mm GSO ex-Dob Newt just fine for planetary imaging
http://www.iceinspace.com.au/forum/s...ad.php?t=85990 - those posts were talking in terms of DSO imaging - I wouldn't even think about trying that.
One of the posts was worried about crushing the struts - if you put the rings on the main tube, no probs. Another was worried about the weight of the main mirror section unbalancing everything - the Dob already has that under control since the El axis passes through the CogG - again not a problem. The real problem is simply one of getting enough stiffness in the coupling between the primary mirror section and the top bit - I have no feel for how strong the truss is. sounds like a really interesting challenge to me, but you would need to be interested in messing with equipment. regards ray