Honda makes grommets for those holes in the strut tower, it just depends on if you want it all to be metal or if you would be okay with grommets in the place of those holes instead
You should try doing longer welds, it looks like you're just tacking the pieces of metal together. Those miller welders are good to use but you have to know how to use them first
Hey @BackYardBuiltHondas love these videos! How did the bolt on core support turn out for the EM1? I'm working on an RSX right now that I'm probably gonna do this for..