In the pic above, fuselage caught my attention; recognize a technique used when building a .15 size kit where short section material is used to represent and space out the tail fairing blocks for shaping as you're doing. May have also been in a "Hints and Kinks" page of M.A.N. magazine allowing shaping and sanding of blocks to desired contour without the actual tail being in the way - works great! Looks great!