Hi Bart
You can arrange the pvc grid/bottles anyway you like as long as they are the same height and you have an intake for the
pump and an overflow to control the height of the water.
The solo cups with holes in them sit in the bottles to make the plants removable so you can clean your garden.
You can then take bedding plants or any size plant that you think the roots will fit in the solo cup after you have washed the dirt off or other
growing medium from the plant roots.
You can even take some plants (especially herbs and spices) and cut the plant into a few plants and
then place them in the solo cups. That's the fast method to fill your garden.
Ron