Making the "hole" template
Okay first, I made a simple cylinder approximately the size of the hole depicted in the 3-view drawing. I made sure to have enough vertical segments on the cylinder to make the boolean operations easier later on.
Cutting the hole on the fuselage
So initially, I thought of doing a subtraction operation (Fuselage - Cylinder).To make the illustrations easier to follow, I deactivated the object mirroring function for the fuselage. This will prevent Metaseq from "drawing" the other half of the fuselage object.
Unfortunately, I don't think it worked out pretty well. Sure, I can clean that up. But I remembered that the Boolean plugin has some weird bugs that sometimes causes hidden faces/surfaces that would give me a lot of headaches later on when I start unrolling in Pepakura.
Nope... I'll have to ditch the subtraction operation.
Instead, I'll use the intersect operation (Fuselage # Cylinder).
The image above shows the result of the intersect operation between the Fuselage and the Cylinder. Still messy, but more manageable.
After a few vertex joins, I was able to simplify the intersection (shown above in red).
With the use of the wire tool, I added the missing faces/surfaces.
Finally, here's what the fuselage looks like when the object mirroring is re-enabled.
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