Can the patisto be made ahead and frozen?

Pastitsio freezes every bit as well as lasagne. No problem cooking it from frozen, either. It generally takes no longer than a frozen lasagne.

Do you mean pastitsio? I haven't tried freezing it it uncooked myself, but I don't think the ingredients would suffer. A bigger concern for me would be cooking the frozen casserole - since pastitsio is usually pretty tall, and some of the ingredients are more dense than the others figuring out a cooking temp and time will be tricky unless you let it thaw first.