Thread:Jenesis33/@comment-26329187-20150806034230/@comment-26289480-20150806035904

Usually it is recommneded to craft Type 3 shell with 91 AP shell.

Although you only kind of need 4 91 AP shell, it doesnt hurt to have more because of later when you upgrade 91 shell (past lvl 6) and Type 1 Ap shell, they both consume 91 AP shell, so having more is good.

Wiht that in mind, the fourmla most widely used is 10 90 90 30

http://kancolle.wikia.com/wiki/Development#Surface_Combat_Equipment

Wiki has the information you need, I am sorry there is no 'shortcut' or magical forumla to craft them. Just try and keep trying.

Flagship it is recommended to use BB, some people say Slow BB are better, but i think thats just urban legend.

Please be aware you can acquire Type 3 Shell from quest and modificatoin as well. Not only crafting.

http://kancolle.wikia.com/wiki/Type_3_Shell

See this page, It is rewarded from K2 Haruna and Hiei.

You also can get one very easy from Quest B40, all you need is a K1 Maya, which is quite easy.

http://kancolle.wikia.com/wiki/Quests#B40

Hope this helps.