With my FSQ106, cameras/OAG, electronics box on EQ6 it doesn't feel excessive. You want it to come down well on all sides so the bottom occy strap keeps all wind/moisture out.
I think you'd get an 8" or even 10" Newt in there ok, but have only ever used it on the refractor and HEQ5 or EQ6 to date....
I won't look as sexy as a telegizmo, but heck I'd rather spend the money on astro toys. You end up with some floppy "ears" either side of the scope where the wider handlebars part is but can always pin that down with an extra strap if you're a slave to looks
