The movie clue made me think Delorean / Bricklin, and there are some similarities to the Siva 160 Spyder:
but that wasn't it either so I gave up - it looks like it was built in a shed using whatever came from the local hardware shop as a copy of something that had been built in a shed. I'm not too familiar with the Czech movie scene either.
Good choice, Michael as I've learned something new!