A new version of the application is now available on my website: http://sr3dbuilder.altervista.org/
and the following is the preview video:
Notice: unregistered users can create a mono-piston motor only.
For details about new features (not too much to say the true) refer to History tab on my website!!
Thanks for the heads-up! Funny that I was building a similar assembly (V4 engine with the angled engine block elements) a few hours ago... but with physical ABS.
I cannot compare the pleasure to work with real LEGO instead of just a virtualization... but, anyway, better that nothing