Engine is O.s. 65AX not sure what pipe or header. no real issues, although the motor mount in this one, is a laminated hard wood rail. as for the extended rudder/fin, this is built from MAN plans and is a near perfect profile of them. *this is a Eureka Aircraft short kit with their foams* VERY HAPPY with this Kit. Glassing will begin soon, I still have several details to iron out like wing seat and fillet some minor shaping around aft of the canopy and raised spine. but hope to get this in the air before end of July, also a mustang Giant scale to be painted and detailed by then....
I will try to answer any question but please let me apologize in advance for not replying promptly..