Planewave

Please check the dimensions before to avoid a possible collition. The inner Tube of the RT Model has a diameter of 63mm, please see:
https://www.baader-planetarium.com/en/downloads/dl/file/id/28/product/2858/bds_rt_dimensions_technical_drawing.pdf
Usually you mount the SC modell and focus with the original focus knob to a range that you can focus all your accessories furthermore with the Diamond Steeltrack SC. Please hold in mind that Meade sometimes uses sligtly different tolerances for the thread, We had some trouble with it in
the past. Which adapter you need for your telescope depends the thread you have. For the Steel Tracks you can find all dimensions under the Link
<Downloads>

We are very sorry in this case we cannot give a recommendation because our reducers are designed for SC telescopes. We never tried them with ACF telescopes. Please ask the manufacturer of your telescope which reducer works best.

You could use Baader 1¼" T-2 nosepiece with Safety Kerfs # 2458106 to attach the FlipMirror to any 1.25" eyepiece holder.
But as both the SkyMax and the FlipMirror have got T-2-threads, it would be much sturdier (and often shorter) to simply screw them together.
To change the orientation of the FlipMirror, you can use e.g.
Baader TQC/TCR Heavy duty T-2 Quick Changing System (T-2 part #06A & #07) # 2456322
or
Baader Complete T-2 Changer System (T-2 parts #06 & #07) # 2456321
You could also use a small T-ring like T-2 Locking ring with lever - for MaxBright® II # 2458271 as counter nut to fix the FliMirror in a conveniant orientation on the thread, but we'd recommend this only if you don't need to change the orientation too often. It also depends on the length of the T-thread on your telescope if there is enough place to safely attach both the rind and the FlipMirror.

Sorry, it is correct that we don't have a direct UFC S70 to M63 adapter available and also currently have no plans to add this to our portfolio. If the backfocus gets to long by combination with our M68 to M63, we recommend to contact www.preciseparts.com and ask them if they can make a direct adapter for you. They can contact us if in doubt about the measurements of the S70 dovetail.

Yes it will hold a 5kg tube easily.