Hello around. I'm just putting that here since I've done it and it'd be a shame not to share.     They've been chosen and arranged so that the line would be focused on good fast-firing main guns. The displacement and sizes sometimes vary up and down in the middle tiers but are fairly consistant in low and high tiers, and main gun power increases steadily while torpedo power starts average and ends up mild. I've thought the best way to implement them would be to give them from tier VII onwards (or if necessary tier VI onwards) a consummable to enhance main guns for a short time (such as decreasing reload and rotation time), which is consistant with the performances of guns such as the US 127mm, the UK 114mm, the 102mm MkQ and the 120mm M50 Bofors which were all fast-firing guns.   Note that, for balance purpose, Acre may only have access to her post-1954 modernized armament.   Overall it was mostly a tree made for fun, but researching the possible ships and trying make a continuous line with a definite, cohesive gameplat was very entertaining.