I'm pretty sure that the deck on my Talacre is lower than it should be. This explains how a deck house that is only just taller than the door would fit to where it's shown on others folks models My deck house is sized to reach from the deck to where it's shown on the sketch.
It also shows quite a gap above the door and I assume that the door wouldn't come right to deck level. (What the USN call "knee-knockers") Caldercraft supplied doors are 37mm (about 6 scale feet).
Still, if I was a "rivet counter" I wouldn't be proceeding without scale drawings. So, as our Australian cousins would say, "She'll be right".