A 200 would be best suited for fewer plants started earlier, obviously. The dimensions of it really limits how many plants you can fit in there.
If possible I'd change course to several smaller pots. I think 10-15s would be plenty for a later season plant like the ecsd cross likely will be.
If you're strapped for cash or space or whatever else makes this the only way you have a season, you've got a couple of options. You could plant about 15-25 and grow conventionally with a screen over the top, much lower than you'd normally install them and a secondary one to support after the stretch, with great results.
I implore you to hear me out on what I would do. It's not going to be much harder but you're definitely going to be pushing a plant count limit with a great harvest.
Plant 12-16 in the center and stake em up with a 10 footer, let them grow into beanpoles. Plant another 20-24 around the edge and have them fill out a vertical screen, filling out until buds set in on their first couple clumps. Cut out a way for you to get in and maintain your inner plants.
Use your container shape to your advantage. A circle has way more area around it than over it and you'll be able to utilize both.