An example?

Is this at all what you are looking for?

4375/4374 7-limit planar temperament

generator 1: 2

generator 2: 3

generator 3: 4.999748162, or 2786.226514 cents

period matrix: [[1, 0, 0, 1], [0, 1, 0, 7], [0, 0, 1, -4]]