Looking for huge (mpd) models

[Jaco van der Molen]

One question though, why are half of the bricks mirrored? At first I thought you drawn half the model and mirrored the whole submodel, but it seems every brick it self is mirrored.

I am not sure but I think I used the Group function in MLCad and mirrored that.
I also used the Duplicate funtion a lot, so chances are that I copied a mirrored part and used it on the other side.