Thanks for your questions.
Did you just have one horizontal tube going across the very top of the garden to water the whole thing, or multiple tubes?
Just one tube on my wall at the top. I'd say one tube for every 8-10 vertical feet although I never measured it on a Blanc wall.
Did you use that regular flexible tubing and poke small holes in it, or was it a soaker hose type thing, or was it one where you had those drip emitters coming out?
I used regular flexible clear hose I bought from my local hardware store and then drilled holes in it. At one point the filter on the pump slipped and sucked up rotting leaves that clogged all the holes. I had to take the tube down to clean the holes. It was sort of a pain. Emitters might have made that process easier. Also emitters can control flow which was an issue at first with my tube. I had to balance pressure and gravity.
And the last question.. when you cut those slits, did you staple the front piece of felt to the back piece of felt to form a pocket, then put the dirt in then plant? Or did you just cut the slit, and put the plant in without dirt?
Great question. I really need to shoot a photo sequence of this but for now here's the description. We cut the slits in the first layer of felt (only the first layer gets cut), took the plant out of the small plastic pot, stuffed it in the slit, and then stapled around it to form a tight little pocket (about 4-5 staples).
Please keep your questions coming.