I hear you! We where getting frustrated, but just had to have a change of attitude. Don’t expect anything to fit correctly and be prepared to sand, check, sand, check and so on. Going into each task expecting it won’t fit correctly and you won’t be disappointed. Rudder, rudder pedals and brake pedals, control linkage, all have to be sand down. Rudder pedals are a pain. Just take your time and don’t rush it. It will pay off down the road when your flying it.