Yup, got the bulkhead squared away and, yes, I did end up crossing the rudder cables - worked great. And I did add another set of triangle stock behind the firewall.
Tackling the engine mounting now (altered the thread title too) ... it appears there will be some exhaust/muffler firewall clearance issues with my Saito 150/180. What approach did you guys take (if you mounted a Saito 4-stroker)?
Thanks for any clues - I think this plane is going to be fun. After building stuff for what seems like a bazillion years, it's great to take a break

Mike