A while back I bought two firewall penetrations from AC Spruce. I really like the one inch version but the 3/4 might be too tight. I made the two holes in the stainless. I've been really happy with the greenlee hole punch set until now. The 1 1/8 hole didn't work very well and I ended up doing a bit of filing to get smooth out the hole after it basically tore open.
Finished up the day with a little riveting on the forward part of the aft skins. Starting to have that finished look without the clecos.