in my tartar challenge thread and in the beginners guide I have included how to calculate the center of gravity. to check if she is bow heavy, you should estimate that and check if you have it above your center of bouyancy.
pm me if you need help with that, I have calculation XLS files which I thrust you would put to good use
it is looking good to me btw.
my only real comment is on your text: IIRC, the spey is more or less the olympus replacement, so hatakaze and similar engined ships were all tyne+ olympus powered, if I remember that correct.
on a sidenote, it is great to see my parts being used to their full potential, in this case sometimes even only days since they are drawn