It's a Skoda Felicia Fun. It turns into a four seat open top!
Kinda like a Transformer??
Pics can be deceptive; When I saw the oil tank top view, it looks like it wraps around the frame, and I thought it was some kind of factory 'special', like someone was after recently, but the side-view dispels that
Looks like a good project, I suggest it's also a longstroke tank and rigid toolbox, but isn't that an original thing anyway- early Spring frame, except you may find that frame is from around about '55/'56- I may be wrong?