Thanks!
WITHOUT GLUE ! I tried to see a little.
The normal Vampire would be this:

My son Jacky (8 years old) invented the push-pull Vampire! Turning or whirling or something, but fast!

Then Jacky invented the Vampire biplane:

And at last Jacky invented the tandem wing Vampire:

Now I will try my way, but maybe transformed a little because I feel lazy, maybe I will not truncate the wings.