A few days ago - whilst actually searching for something else, ha - I stumbled upon this link to a full manual for the Ro.57. It's great, and contains among other things a dimensioned drawing of the interesting forward-swept outer wing panels.
https://es.slideshare.net/TahirSadikovi ... -manualpdf
IMAM Ro.57 manual
Re: IMAM Ro.57 manual
Lots of useful drawings there, thanks for sharing!
Re: IMAM Ro.57 manual
Sad to say, it appears this material has now been taken down.