Need Advice in Scale Helicopters

My first build, setting the mechanics in the fuselage and I need to extend the main rotor and I need some advice on the linkage. It will need to be lengthened as well. What is the best practice? Thank you

Building bell 206 using the align 800 mechanics setting the mechanics on the wood frame, the tail rotor is about 1/2 - 5/8 " to high. My first thought is to drop the rear cross member 1/2 - 5/8 " to get the tail boom on center with the opening for the tail boom drive shaft to exit the fuselage. Thoughts from anyone who might have experienced this.