Alpha, your video reminds me of a video that I made many years ago. I think it was in 1986?!
In this video I also had a decapitation scene. But without any computer graphics (it was the time of Commodore-64 computers).

Now I have transferred this very old video (Video-8 tape) to my computer.
Here it is:
Download Video (22,8 MB)

And some pictures:


My film should have been a parody of Star Trek and Star Wars. But it was never finished.
This video is only a short compilation of the best scenes.
All models, the special effects, the bridge of the 'Enterprise', the remote-controlled 'R2D2', etc., I had created myself.
In the role of James T. Kork you can see me - 25 years ago.