@ finchOU
I think I can answer your question on behalf of Vecko.
Talking about TWoS and TDW's options editor, unless I am very much mistaken, nothing has changed compared to when you enabled NewUIs as a single mod. You can either:
a) Enable TWoS firts and edit then UI options by making the editor to point to the copy of TDW's option file contained directly into the Silent Hunter 5\data path, or...
b) Edit UI options making the option editor to point to the copy of TDW's option file contained in the Silent Hunter 5\MODS\TWoS\data folder, and then enable the mega mod.
The difference between the two methods, is that by using the first one you will need to re-edit your options whenever you disable/re-enable TWoS, whereas if you use the second method your changes will be retained, no matter how many times you disable/re-enable the mega mod.
