Great Planes Giant U-Can-Do 3D - GPMA1271 - Manual (Page 14)

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3. With your assistant holding the cowl in position, drill
holes 2" [50mm] above and below the first screw. Secure
this side of the cowl with two more #2 x 1/2" [13mm] screws
and #2 washers.
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4. Secure the other side of the cowl with three #2 x 1/2"
[13mm] screws and #2 washers.
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5. Remove the cowl. Harden the threads in the fuse with
thin CA.
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6. Use thin cardboard or plastic to make templates for
the muffler, mixture screw, filler valve and glow plug cutouts
in the cowl. Tape the template(s) to the fuselage, accurately
indicating the positions. Note: With this engine installation
we installed the muffler bolts through two 1/4" [6mm] holes
in the right side of the cowl.
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7. Remount the cowl under the templates. Use a felt-tip
pen to transfer the holes in the template onto the cowl.
Remove the templates and the cowl.
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8. Cut out the holes in the cowl with a high-speed rotary
tool and a small cutting bit.
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9. Cut the air opening in the front of the cowl as shown.
The shape of the hole is not that important, but you’ll need
a hole at least as big as shown in the photo. Note: Do not
remount the cowl. The fuel tank, fuel line and throttle
pushrod still need to be installed.
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