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I've got an RC10, a Moonlite focuser, the ASI 1600MM and the Astro-Physics AP-CCDT67 - on a G11.
I can just comfortably handle the RC10 onto the mount, so going heavier would not be an option for me.
The Moonlite focuser works very well and holds the gear well. If you get a heavier camera, you might need something a bit stronger. For an ASI1600 though it will not be a problem.
For the reducer, I mostly used that with an ST8XE and it gave a flat field. I think I've used it with the ASI1600 as well (I got a refractor around the same time and have been using that more recently) and again I seem to recall no issues with the field.
I've been using 1.25" filters with the ASI1600, but I'm in the process of switching to 36mm to hopefully reduce the vignetting a bit more (and they should be better quality filters, etc).
For an OAG, I use the TS OAG - it's about 9mm? in width I think - very thin.
For the ASI1600, most people tend to use the ZWO FW with it. I went Xagyl instead as at the time the ZWO version wasn't quite ready. I think either should be fine.
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