How can i cull the lines outside of the surface boundary

Grasshopper
1

i followed a tutorial on how to do a lunchbox truss system script on youtube and want to limit the curves to boundary of the surface i understand the the surface is irregular but im not good enough with grasshopper to understand how to fix it.

boundary
boundary1111×645 192 KB

weird srf.3dm (68.8 KB)
structure_lunchbox-script.gh (8.9 KB)

ive left an image and the files it that helps

2

This could be a workaround but, you may get some overhangs along with your surface boundary edges.

Canvas at 18;42;02
Canvas at 18;42;021751×748 130 KB

structure_lunchbox-script_re.gh (28.9 KB)

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