B-Manic,
Thanks for the valuable tips. Next time when I build another ship, I will start building major structure first.
Regarding the wrong side, there are several things I did wrong.
1. Chimmy : up side down. (black part should be upper).
2. 4 Torpedo(?): reversed (position of head and tail were reversed).
3. Rolling mat(?): Should be rolled several times (but I had only one roll).
4. And many others.
I realized those things after I attached. So, it was not possible to fix them without major surgery. Since this is my first trial to build a paper model, I am considering this building as an experience to get the necessary skills. So, for me, those errors are acceptable at this point.
By the way, what is 'Y' mount? I am not familar with the terminology used in war-ship. This is also a part I am trying to learn...
Your gun and others in the picture looks perfect for me.... I envy you.
Thanks
JN