The picture is impressive, but this isn't romaine lettuce, not even any other lettuce - no way. Although it's called so at the blog the picture provides from. That looks much more like over matured Pak Choi or some other related chinese kale type. Btw: look at the hand at the left, not at the head of the guy, that gives you a better proportion of the size.
Romaine lettuce can be grown under the very same conditions and setups as other lettuce types. As I said earlier, if some type grows a bit to big - simply harvest earlier. It's more delicious and has higher nutritive value at an earlier stage anyways.
One Foot (1') is standard an deep enough for lettuce in Deep Water Culture.
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