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My objective was still the same. Make 20+ of any packs in 30 seconds or less. After my first try, I learned that 20 was not such a great number of labs to have and could waste packs depending on how many steps a research have. However, this is no longer a problem in 0.12.
Notable improvement since first try:
1) Much better use of space.
2) Cleaner looking
3) Drastically reduce the size of science pack loop. Only a dozen or so of stockpiled packs per lab.
4) Steel smelted on site.
5) No extra copper cable assembly.
In case of a shortage of iron, the factory will naturally favor red pack first, then green and then blue. So you can research lower tier research until your iron shortage is fixed. This also allow you to build just the parts you need for each colors of packs as you go along and progress in the tech tree and new colors of packs become required.
Good or bad, I want to know what you guys think about it.