Smooth loft from splines


I want to connect the red curves in the image through a smooth surface, in order to offset it and create a space structure with lunchbox. These surface should follow a similiar geometry to the one created by the blue lines.I drew these blue lines by hand, since it was necessary for the loft command that all the selection were either open or closed curves. Nonetheless, when I loft the blue curves, the result is irregular (image2). Is there any way to solve tis?

Thank you in advance!!

image%20gh%20file image1 image2 Space frame 2 (12.9 KB) loft surface from splines.3dm (240.8 KB)