Getting out the Fairchild
71, starting with some vacuform basics:
Photo 1 shows some initial scribe lines to be made with the hobby
knife, highlighted in pencil here. Straight runs between the arrows
are best cut along a straightedge, when you get to them.
Photo 2. Scribing freehand along the base of raised parts goes
pretty easy.
Photo 3. As long as curves are kept gentle, breaking along the
scores only takes a couple of bends back and forth. Unscored sheet
styrene will flex A LOT before it actually breaks.
Photo 4. The front fuselage halves and "turtle deck"
fairing are kept in one piece until after they have been sanded
to the center seam of those halves (the level of the surface of
the surrounding scrap); it's just better that way...