After some battles i still can't get used to a 3 guns setup ._.
with 2 guns either AW or SW it's really really easy to go aver 100k attack, and on the back i put an HH that saved me lots of times xD
Maybe the problem is that i try to linefight with 3 guns, i played only km ships since we had to pay to play after lvl 30, so that's some years that i play in the same way... and other uk bb tiers didn't help me learning how to deal with low range without front rushing: nelson and kgv is just rush and win, qe and repulse with those mark3 have almost bismark's range, and i almost skipped bb1s... at least L2 will have second best range :D
i thought that structural was related to shells resistance, something that described in game the "submergence" i heard several times here. and bulckhead was only to help not loosing OH. And from what i saw the more structural the more the ship is resistant... well, i was totally wrong then xD