Green Flyer,
You didn't specify kit or ARF.
I only have experience with ARFs so far.
All of the instructions have you putting tail feathers on early in the process and installing engine and radio later.
I disagree!
I get the internals done first then the externals - leave flexibility for adjusting the CG.
If I didn't do it that way the tail feathers would probably be destroyed in the process of mounting the engine and electronics.
Just my preference.
KW_Counter