gluing the plastic bottle cap to the thinwall?
 

Just a couple of questions. 1. Does regular PVC cement work on gluing the plastic bottle cap to the thinwall? Or do you use another type here?

2. I notice that most of your designs are grid patterns. Still, the 1-gallon bottles on the 4" appears to be linear. Are there any problems associated with running a single, linear, run of containers? Thanks, Aaron

Yes It just softens the PVC to except the bottle cap. It doesn't soften the cap plastic so you could pop the cap out if you had to. You could also use a little silicon if you have any leaks.

No it doesn't matter how the gardens are laid out or how far apart the bottles are. As for the ebb and flow gardens it only matters that they are all level.