Hello Philo!
I also wouldn't want you to take my maessage as criticism, I just think the kit, or the development of the Titanic you are working with is poor or maybe very poor.
Working with model kits (not only paper) it's worth to keep some things in mind:
-don't rush it take your time (that's kinda obvious)
-check for straightness often (especially true in case of paper models)
-check your references, kits are not the ultimate truth an can and should be corrected (that Titanic is the best example here)
If you like, there are many better paper model kits of the Titanic - Maly Modelarz, Fly Model, JSC and Szkutnik all make one. GPM makes a paper diorama of the sinking Titanic - I have to show you that:
Good luck with your build and have a nice day
Paweł