Hi ! Bro, I still not yet building bcos very busy of my work, I am using 3pks 2.4 , steering servo use hpi , thro should be use HX 5010 (6.9 kg) or HXT 10KG metal servo, also will keep Turnigy S8166M (29KG ) for steering spare servo., all the servo order from Hobby city. Winnie and Ken shop price are the same.