Its not complete, but it allows the creation and editing of simple meshes.
For example, take a simple box and make a cross out of it using 'extrude', or do the same to a cylinder to create a gear with teeth.
oh and if you use Contact's 'f11' save world key you can keep the resulting world.
Here is a list of what doesn't work:
1) cone and sphere primative shapes. I'll have to work on that.
2) the left panel (edit meshes) create, move, rotate,scale and push aren't done yet.
3) no way to alter the colour or position of geometry.