Tank calibration in Maxsurf

Hello everyone,

I've got one question for all of you. I've got a task to make a Tank Calibration Table for existing ship in which we modifed one tank (split it in two separate tanks). Only what I've got is a boundaries of this tank in 3dm file.

Is there any fast way to do it in Maxsurf without reverse enginnering of the hull shape etc. I need only to make small change in stability booklet about that calibration and I am looking for a fastest and most convinient method of doing it. Also the problem is I am not that familiar with Maxsurf because I was mainly using Foran.

3dm file in attachment.

Thanks in advance!