Heya!
I'm happy that you enjoyed my input.
I was going to mention the age on my previous post, but then it got so long that i forgot about it.
The plants seem very young indeed, you could let them grow free for some time, with a little pinching here and there so that they grow in diferent shapes.
You could also get them into the pot, if you want your group planting asap, and then pinch them, but the growth would be much slower.
Good luck with this awsome project, i look forward to see how it will develop.
Diogo