After going through dozens of contradictory documents for hours, I am about to give up... Here is the current version of my take on the Prestanneth. What do you think?
Note: nasal+hw... was the most difficult to decide. Depending on how old the formation is, it changes a lot. I even considered "i/a thw..." The phonetic rules for this one were either too obscure, or too contradictory. The same can be said for a few others as well, if not for all