Almost halfway into the build, just want to salute to the original designer of this BOT. I now realized that changing just a couple minor things will have a huge impact. Details are below:
I decide to use socket cap bolts instead of socket button bolts. I had bad experience with button head bolts previously. But I did not replace the bolts in the 3D model. Here is the result:
As you can see a small change like this will have a bad effect on the build. I needed to re-drill the holes on the brackets to make the bolt heads fit.
As far as painting the aluminum parts, sure the bolts will take some paint off, but where the paint stays it looks nice