I sketched out the curves and everything is in the right spot I think, so I selected a closed set of curves and did a network on them. My problem is 2 fold:
a) I have no control over how it interpolates it. You can see a weird lump happening on the corners in the top view.
b) I can't thicken the thing, via outline or extrude (although I know extrude is just directional, not along normals).
I suspect i'm just coming at this from the wrong direction, as though i'm poly modelling it. Any input is appreciated :)