Everything's looking good, my man. I will say, if I may, that you might have a hell of a time sanding those shoulders down.
You might have some luck splitting the model up in your slicer and assembling them after the fact with two-part epoxy. I do this a lot for models that don't have a clean flat edge to serve as a bottom surface.
With that shoulder you could have split it in half lengthwise and printed it along the cut edge. You may still need some supports on the inside overhangs but you'll have a cleaner result overall.
Everything else is looking killer, though!
