As a testrun for my very first tryout of Mecabricks, here's a retro rocketcraft design based upon an original build from Nathan Proudlove:
Here are the instructions the recreation was based upon, as put together by Tyler Clites(Legohaulic)...
Flickr - Classic Rocket Instructions by Nathan Proudlove
...and here's my 3D recreation of it to view and tinker with at Mecabricks!
Mecabricks - Nathan Proudlove's Rocketcraft by Digger of Bricks