I have hunted here as well as in the SPAD forum for the build thread I'm looking for. I just can't find it again. The first time I saw the thread was sometime within the last two to three years. The main feature of the build was the firewall which allowed for quick engine changes for the purpose of trying different converted gassers, which is why I'm posting this here. A friend of mine wants to see an example of a big coro gasser airframe, so that's why I'm looking. I hope someone remembers the thread and can point me to it. Thanks!