Step 1: First, draw it
The measures are approximate, need not be accurate.
Mi finger and the pen there are as a reference
Step 2: Cut
The greyed triangle under the body it is waste.
Step 3: Folding and shaping
Step 4: Balancing and final
Add / Remove weight in the nose to achieve it.
And this is all. The plane must fly 3 or 4 meters. That is no small thing, considering the size.