Is this going to be milled on a conventional milling machine? Or will it be fabricated via another method? (I'm assuming that it's going to be milled, due to the lack of bend radaii on the edges that would be there if fabricated from sheet metal (via laserjet, waterjet, or turret/punch) and then bent up.)
If it is going to be fabricated via a conventional [CNC] milling machine, then why make it such an odd shape when you can make it more "squareish" to make it easier (and faster) to mill?
(E.g. leave the entire face-mounting side square, and mill two pockets in it (one to the side of the axle, one underneath). 