Thanks Oldtool. The 'lil hammer feels nice in my hand and balanced which wasn't a goal when making it. 
I've decided against the quick connect bolt cap. I don't like the hole either. It's not very aesthetically appealing. Hex head or carriage head in brass is my goal. Only thing is brass is softer than steel and my concern is tapping it against steel over time may ding it up. 
While the plastic plug caps give a profile I like I'm probably going to ditch that idea as well. 
I'm going to stay with brass. I'll continue my search.
Thanks for your input!