ldd -> mlcad woes

i was trying to make some nice pdf directions so i exported from ldd to lxf. lpub sees it all as one giant step (i'm not sure of any way to create autosteps in lpub). opening it up in mlcad, it's put the parts in reverse order - thus if i autostep it, it builds from the top of the model down.

anyone know if there's a way to either autostep in lpub or to reverse the order of the bricks in mlcad?