base grid for vault structure

Hi, what could be the best way to get regular grid lines inside the input boundary closed curve or surface like on these pictures. I want them for use in kangaroo.

(I have tried:

A)WB quad split subdivision, or other wb subdivisions

B)surface to mesh - when the surface have to be lofted - good qrid from quads, but problems in the corners and points of bend

C)make it manually - lot of work

It seems that it could be easy done with kangaroo relaxing - but I dont have the strings - and thats my problem over and over again for whole week)     

regards

J.