Welcome Lippisch!
Interesting concept.
Does the tail have control surfaces?
Or does the craft have high pressure bleed off for directional control, similar to the Harriers 'puffer' jets?
If neither of these, then i'm aware, in the real world! you have a ballistic model concept,
similar to a dart, then again unlike a dart it has forward motive power, after all we ARE in the world of What If?
Paul. Watching with interest