Hi Noktavian
Up down snap has yet to be fully implemented but its still possible ...
Place your lower floor ...then select your second ....BUT use PGUP and PGDOWN to raise it above the floor level...then click to release it ..
Then click the higher level and select "Properties"
you will then go into 3Dview.
using the arrow keys you will then be able to align the upper level up and down..
It sounds a lot but once you get the hang of it its a pretty quick process
Hope that helps
The only person ever to get all his work done by "Friday" was Robinson Crusoe..
