[66Project]

I've taken a uni-bit or some call it a step bit and drill the hole open a bit to get to some thicker/better metal. Then repair however you can. If you didn't drill it out that much then you can just weld it up but if you have to make a small patch, the nice round hole makes it easier to do so.

The little bit of research I've done in the past about using silicone bronze for patch panel work is not a good idea. Something about the metals expanding and contracting at different rates causing a ghost lines in the finished paint. Maybe not a big deal since your just doing little holes. No experience here though so maybe someone else can chime in.

Nice job with the metal fab BTW.