Hi: One of the biggest parts of the machining learning curve is fixturing...
You could machine it out of a "brick",and leave additional material at the ends of the part, that would be held by the vise, or by clamps.One side is machined, the part is flipped, and the other side machined. Afterwards the excess material is bandsawed,milled away. Alternately you have a feature there (the bore) that could be used to arrest some degrees of freedom, and be used to index the part.(You could create the bore as one of the first operations).
When designing, try to keep in mind the subsequent machining processes,if you cannot envision how you are going to be able to manufacture the final part, change the design until you can.
nice looking part.