Indeed ... thanks Richard!
I've posted the 1953 Letov KBL-12 project separately:
http://www.secretprojects.co.uk/forum/index.php/topic,5686.0.html
Forgot to mention, there is also a Payen PA 249 page under 'Projets':
http://minijets.org/typo3/index.php?id=128
So far, just this profile image.