I am still puzzled by you choosing to ignore it as being "external" since in literally all the photos in the "Budo" book the Founder is in hanmi and according to Saito Morihiro's commentary in the same book (and common sense) hanmi=roppo=six direction kamae (p34 in the special edition). Its IPSNEH (In Plain Sight Not Even Hidden).
As to weather or not to mimic the details of Ueshiba's angles - I think you (all of us) should.
Hanmi is as divorced from "creating structure" as eating cheese.
Thinking it is -linked-to creating structure is a profound failure.
This is continuously shown in open rooms , now in front of hundreds of teachers and students alike. We can pretend it isn't happening, but we would be just pretending.
Ueshiba pointed to traditional methods for creating structure. I will leave it up to you to figure out why he never mentioned hanmi as having any part in that.
I say the reason he never did....is because it doesn't have a damn thing to do with internal structure.