I could remove the rounded edges off the parts no problem, they are purely aesthetic. What I've done with those parts is simply take the original plastic part and replicate it, the design could be simplified no problem.

The reason for brass is as Jonathan highlights, the eye candy factor... Steel weights are starting to pop up but they simply lack any style or bling factor.

I will revise the designs tonight for simplicity, if anyone would like the files please let me know. Maybe someone with a bit of brass knocking about could machine one for me to try? Paid of course.