Ender 3 Duct Ring

Loving the work of others, notably:
https://www.thingiverse.com/thing:2912394
https://www.thingiverse.com/thing:3343456
https://www.thingiverse.com/thing:3478935

but wanting to verify the flow design (in simscale), I searched onshape and found this:
https://cad.onshape.com/documents/b98cd22c03a7a4e5655154f0/w/53716c81b348440ab5b15dad/e/50e625e6e930601d7ad8990e

which appears to be inspired by the original ring design above, so this thing is a copy and extension of that:
https://cad.onshape.com/documents/197ff82b00bce0655e01afc4/w/81aaaae9e7306fe7a968a6c3/e/afcc5947de77a0d9033eaa04
(if you are JACJR on onshape, let me know and I can credit you properly)

This is a work in progress, so far I have only made small modifications to the design:
thickened one wall of the ring
added a chamfer in a couple of places (or changed from a fillet on the bed)
modified the outlet to allow it to bridge the opening
sharpened up the trailing edge of the flow dividers

I have run a simul