I am also going to open it up around the spinner and do the vent thing, more cooling for the motor the better! interesting which way the flow will be through the front holes as the spinner even though smooth will act a little like a centrifugal fan when spinning at 8000 rpm perhaps but I guess we will never really know I think once finished I will seal the main body of the plane from the engine bay to keep fumes and oil out of there...... I persisted with the single rod and Y forks to the tail works ok now as I have put in two tube guides with 12mm balsa