thank you everybody 
yes that was a very busy month ...
I began 3d last october with Zbrush and I tried to find a nice way to do mechanics.
And Sketchup is perfect, I think, for that .
@Solo I hope I understood your question , because my english is not very good. The human parts are entirely made with Makehuman (body and pose), I just cut , or erase some parts of it .









