Hi Joao,

Yeah, it's been discussed a few times, Michael has plans for some basic communication tools at some stage.

Here are some past discussions, Sketchup looks good for the free option.

http://moi3d.com/forum/index.php?webtag=MOI&msg=2298.1

http://moi3d.com/forum/index.php?webtag=MOI&msg=2308.5

Cheers