How To Make An Upside Down Tomato Planter

I've been wanting to try an upside down planter for a while and then found this DIY post for how to make your own. There's some discussion in the comments whether this pot holds enough soil for the tomato plant, but as noted in the author's post, you could try a container friendly tomato plant. I'd compare the size of the upside down planter in the stores to the size of planter you'd like to make (if they're the same size it should be ok - right?).

How To and more photos from here.