I have to find out some more about this car but here's essentially what I currently know.
It's an ID19. Year unknown, but likely late 50's or early 60's.
Missing engine and numerous under bonnet bits, but I also got a donor front cut with most stuff there.
Car was dry stored for a long time - rust unknown.
Discussion here: //oldschool.co.nz/index.php?/topic/43905-pee-dubs-citro%C3%ABn-id19/
Trademe ad. Bargain purchase price, but the resto is gonna be expensive I'm thinking...