To get the top skip locked into place, it has to be match drilled with the firewall flange. I did my best to mark the fastener location on the flange, but it was a fairly tricky because the firewall flange is not a consistent length. Over the full distance of the firewall, everything should turn out fine.
I got the top skin clecoed and clamped into place. I used a bunch of clamps around the firewall to maintain the proper alignment.
Here is the match drilled firewall flange.
