What is the area you want the stand or stands to cover?? And what is your max hight??
One quick possibility without knowing your set up, you could get those kitty litter boxes that are approx 1x2, drill holes in the bottom, put a 1 in layer of grow rocks at the bottom, opptional and then place another litter box of the same size under that box for run off. Just put something like some3 inch stacks of lego's on all 4 corners to keep the top tray up and you will just have to change the bottem box every 3 to 4 days.
Ever grown in coco before? What kind of coco will you use? I know a few things about coco, so feel free to ask any questions.
In those litter boxes you can put 4 to 8 plants in each one depending on how long your veging for. 6 in each would give you 6 trays and you could move each tray around as you needed to.

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