Garden tubes... use upholstery tube bags...fill with soil..
Poke holes and plant inside...
Use water beads to retain moisture. Maybe inbed with vinyl or other cheap, flexible tubing to water throughly.
Make grow light frame from 2x4 and use the wire grates from the big greenhouse as shelves. Similar design as the grow light frames in garden catalogs.
Line the JA side of the garden with straw bales and plant watermelons in them ; Start researching straw bale gardening.