The soap opera continues :-(
Yesterday I started to make a mold for the firewall. Found my RTV had gone bad, and needed new stuff. Ordered a new batch. Two hours later I went down to work bench to work on Trail 70, since I needed that firewall to continue on speedster, and didn't want to do anything with new kit firewall till I made a copy.
There on my chair was the old, missing firewall! Now, just the day before I had found the missing cylinder head for my Trail 70, caught between the seat cushion and the armrest support. I guess the Speedster firewall was caught in same space, and sitting down and getting back up caused the firewall to pop back out.
Anyway, got a final (I hope) coat of paint on firewall and put it in drying box overnight. It should be ready to mount today.