Sounds like you've got your roof under control now. Good work!
And as for the cross, that is my point, the "t" was most likely never used in that situation. It would have taken endless hours to have constructed a cross such as is always depicted... and all this happened in a very short time span. As I have said, yes, it "could" have eventually been done in about two weeks (maybe even more) by a good craftsman. But it's highly unlikely someone of that caliber would be wasted on a rough and tumble death squad. Those guys would be off building palaces..... not assigned to an outpost in Israel. (Remember, this person would have to already be there, ready and waiting....... It would have taken weeks to get him there from Rome (or wherever he might be).