Thanks so much for all kind responses and suggestions! I really appreciate them!
Wojszwillo,
1) Agree. I think "Niphon" is not familiar with the fine fishing line. I don't know whether it's available locally.
2) You should look closely. It was not only painted but also weathered!
plastickjunkie, one reason the threads look fuzzy is the time it took to build this one and this one alone - from 1 Apr 2009 to 31 Oct 2010. That's a year and seven months straight. Dust had so much time building up on them. Between the .003 or .004 nylon and finest copper wire (I don't know its diameter but it's very fine), what do you think is a better choice?
A wooden base may be better, but it costs some bucks and the provided base will not be used. And that's a waste! I see no gap in the 4th picture.
potchip, I'll have to look for the meaning of 'ensigns' to know what part you mean.
warshipguy, I see nothing wrong with those lines. They represent seams between iron plates, don't they? Tamiya's Yamato 1:350 doesn't come with these lines, I remember my other modeler scribed them up which is above and beyond the call of duty.