Chris, I have been looking to swap my Atik 4000 OSC for an Atik 383L... if interested, drop me a line and we can maybe go from there - I am happy to swap straight up (the Atik 4000 is a $5K camera). I haven't forgotten the WO dovetail either
My focuser drawtube is 4" - I don't think that'll vignette with the 383