RE: Nitro Planes CMP P28 Piper Arrow ARF
Re: Tail
No I haven't modded the tail though I did consider doing so given it's rather large size.
You could add CF support "struts" which will look unscale-like... or if you desired...
CAREFULLY cut a divot or tube area to insert sufficiently thick CF rod and glue the CF rod in place from the bottom of the elevator, then cover with white covering.
Remember that any such rod does NOT have to transverse the entire elevator to provide additional strength.
Even adding a CF rod that protrudes only 1/3 of the way in from the elevator root into the elevator wing area, alone is enough to add a good amount of strength, and 1/2 way in will provide maximum structural strength without damaging the look.