Excellent job on the dust shoe, and especially the posting of the documentation and parts list.
I have been using the Kent shoes with good success and I like the 4 inch hose capacity. When paired with something like a 1 - 2 hp dust collector, it does a great job. I can see why you do not want to run a full 5hp just for the Shark over long runs.
Initially, NWA warned against using dust collectors on the non-hd sharks due to gantry deflection issues. Now they sell an adapter for it, so I am confused on their position on this. The 4 inch highly flexible hose that Rockler sells is great for dust collection as it is springy, and you can set it up to be weight neutral. I don't know of any small hoses that can do that.
I agree completely on the benefit of the clear material, and have fitted my shoes with led lights inside the shoe, and that helps visibility a lot also.
Also agree on the benefit of the spindle, nice and quiet, with no brushes to wear out
For folks with the non-HD machines which would not fit up a spindle without modifications, It is possible to make a nice custom shoe for the smaller non-hd models, if you make the top piece of the two piece shoe as a replacement piece for the existing z axis part that holds the router clamp. That new replacement piece holds the router clamp, the hose connection, and the magnets. It does not need to follow the outer contour of the brush holder part (it could be smaller around the router end) . The removable brush section also serves as sealing the top off by having only the router hole, the hose, and the space between them open in an otherwise solid top piece that could also have recesses cut in it to fit up snug around the z axis side plates that extend below the new router/hose mount plate. I'm sorry I don't have any pictures handy. This allows full access to the router and bit change button as the lower router mount plate is replaced by the new plate which is also the hose and magnet holding plate.. When the "brush plate" is removed , the router bottom is exposed as normal. Actually, no reason why you could not do the same on the HD versions. Basically, you replace the router mount plate with a new enlarged one that holds the hose connection and magnets. Feel free to use that design for non-commercial use. If there is any interest I'll see if I can find my old files on this.