Transport belt madness solutions

[wrtlprnft]

I realize this is kind of a spoiler, but I'm curious as to how other people solved the final levels of transport belt madness.

These are my solutions: lv3 lv4 lv5

Has anyone found a good use (i.e. saved a significant amount of belts/tunnels) for the two long handed inserters on the last challenge?

EDIT: Since the final level is symmetric, I was pondering about a symmetric solution, but that appears to be impossible because 6 traces would compete for the central tile, and you can only cross 3 traces in a symmetric fashion (2 with the constraints imposed by the solar panels)

[kovarex]

I feel, like the last level is way too easy.

[wrtlprnft]

I've got another solution for lv4. No fast underground belts. Is that cheating?

I think I could stuff about two more belts into my lv5 solution without reorganizing everything. The belts challenge is my favorite of the scenario pack, I like how it's pretty much the same thing as routing a PCB.

EDIT: Here's another one. Just one pair of tunnels and 12 fast belts