no pics yet but I'm going to be building more in a few weeks. Will try to remember to take pics. Nothing to difficult though. Using 3.5 gal buckets. I get the pvc tubes already the right size at Lowes in the plumbing section (at mine, it's in the section where you get the S-shaped drain tubes, etc). It's only about 14 inches or so. The tube section on end as a slight lip on one end. I drill some holes in the end I'm placing towards the bottom (for me its the lipped end). I wrap some landscaping root-blocking cloth around that end and use a zip-tie to hold it in place (to prevent roots from getting into the tube)
I am using the lid that comes with the bucket too. I cut 2 holes in the lid. 1 the size of the tube diameter - close to the edge so I can slip the lid in place over the bucket, with the tube sticking out. The other hole is about 4 inches in the center, so the plant can grow out. Found that it helps, especially in the summer, to reduce evaporation from the "soil".
When I fill the bucket I just hold the tube in place, place the lid on but not snapped in place - I just slip it over the tube & spin the lid out of the way for now. Originally I tried gluing the tube in place first, but that became a pain. So I hold it in place. Fill the bucket. Once the soil-less mix is about halfway, I just let the tube stand on its own and continue filling.
The first watering before I even put the plant in there, I actually water the whole bucket until the flag raises, then after that first watering I water using the tube. Put the lid in place.
Next run before snapping lid in place, I'm going to put black plastic sheeting over the top of the "soil" to further help reduce evaporation. Then cross a large "X" in the center of the sheeting for the plant.
I'm just working with seeds right now. Been just putting them in soaked rapid rooter plugs. Then putting the plug directly into the "soil". So far 100% germ. If I was working with seeds I wasn't sure about - I wouldn't put together the bucket until I got a sprout.
Hope that all makes sense. Still a work in progress. Have a couple of other ideas which I might implement. Bascially it's like a modified Hempy/EarthBox bucket.