Have I mentioned how much I dislike working with stainless steel? Probably won't do me any good so I won't.
Anyhow, continued the firewall installation by: riveting the bottom section together cutting the top section to shape designed a way to drill the four 0.250 mounting holes - round and on location (have I mentioned how much I dislike working with stainless steel?) match drilled the top section to the bottom section. located and marked the bottom panel to the bottom section.
BTW - have I mentioned how much I dislike working with stainless steel?