Since you didn't say exactly how much space you have or how big a box you want to use. I want to know are you planning to place them all in the same dirt in the box??? If so, this may not work, Basil and Rosemary can grow quite big and tall, which will shade the lower growing herbs. The area should recieve enough light though for the plants not shaded by others...Also the mint could take over the box and choke some of the others out. I would try to arrange indiviual pots in a box and maybe rotate the pots or box weekly. If you have enough room maybe try using two flower boxes with the lower growing ones in the front of the window and the taller ones behind, just suggestions. Also the water requirments for all of those plants are not the same which also could be a problem.

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Flower boxes are just boxes that have drainage holes in the bottom so the water doesn't sit where the roots can get root rot.

I agree with Comfrey that putting them in the same container is not a good idea. I can just see myself trying to reach over to harvest some of the leaves and breaking off branches from the basil that has taken the higher ground so to speak lol. But that's just me.

What would look really pretty are some of those stair step space savers stacked in that area then you could have your pots arranged smaller down front and larger on top. that would look really cool. You might want to hang a FS Light above the area to increase the light for the shorter plants.

Well I've decided I want a triangular space in my kitchen when I get one. That just sounds so pretty.

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sure comfrey and tkhooper !Thanks for all the great advice. I will look around for big boxes on a weekend and also look for Lavender plant. I will definitely post pics of my kitchen triangle soon