Watering grid for square foot gardening.

Edmonton, AB(Zone 3a)

I am looking to build a watering grid something like this for square foot gardening, I plan on building a 4'x4' vegetable garden.
Through my google searches I have seen a variety of grids that people have built. Some use micro sprinklers and others have holes drilled along in each grid. I was leaning towards drilling holes in the tubing for each grid. I plan on using 1/2" blank tubing from Rain Bird. And the barbed Tees, and elbows also from Rain Bird.
Does anyone have any tips or suggestions? I've never done square foot gardening or built a watering system.
How big would I have to drill the holes in the tubing and how many holes per side cover each 12" square?

Thumbnail by robertsonj88
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