Great Planes Sequence 1.20 EP/GP ARF - GPMA1232 - Manual (Page 17)

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5. Test fi t the cowl and see where it needs to be cut next.
Mark the inside again if necessary, or switch to a fi ne-point
felt-pen to mark the outside. Remove the cowl and continue
to cut in small increments.
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6. Proceed slowly continuing to fi t, mark and cut the cowl
in small increments until you can get it over the engine—
as you really “zero-in” on the cutout, switch to the sanding
drum. When you’re really close, install the spinner back plate
for aligning the front of the cowl. Replace the head or valve
cover onto the engine and continue to adjust the cutout
accordingly. Don’t worry about perfecting the cutout yet—for
now just make the cutout large enough to fi t over the engine
as closely as possible. The fi nal cutout will be perfected after
the cowl has actually been mounted to the fuselage.