Since your asking for opinions and suggestions I'll toss mine out there.
The one thing I dont like about custom shooter rods is they rarely look good on the machine static unless adjusted.
My goal would be to have a shooter that looks great after you plunge it and release multiple times.
Faces and objects that tend to go sideways or upside down bug me (little ocd).

So that being said I like the traditional ball center post #13 but lose the two front facing prongs.
The shaft attaching point needs to be a strong as it can be so I would remove the ornamentation at the attaching point.
Lastly it needs to come out no more than 3 inches from the housing so scaling is key (pun intended ).
Move he Houdini logo forward centering between attaching point and ball.

What material are you using?

Now we are cooking.