It looks like that you and I have the same 6 inch Skywatcher Newtonian, 1000mm focal length. 1.25inch rack and pinion focuser. But the focuser is different?
When I was contemplating on the Skywatcher the guy in the shop where I bought it from said that the part that holds the telescope eyepiece can be unscrewed and a T-adapter for a dslr can be attached directly on it which gives enough space to focus, albeit a very close one, 2-5mm to the edge of the metal where the drawtube is attached. Yours obviously don't have the same thread on the focuser or you wouldn't have gone through with the modifications.
My scope came with an EQ-3 mount and goto. I would love a heavier mount but I have a very bad back. Despite this I am quite happy with the images I get from this setup from my backyard. I have to get a lot of short subs though. Because the RA tracking is quite bad (it jumps two or three times in one cycle). PEC seems to correct for this, problem is PEC is not permanent with this type of goto. I thought about guiding with this mount but I have to think of the extra weight with a guidescope or the extra focus travel if I use a splitter. I have attached some photos of my newt, so you can see what I mean. We wish you the best!
