Alexandre Moreau - I built your chevaux de frise today, and they came out great!
I'd imagine that if they were built any smaller, they'd be harder to assemble. As it is, I was able to build four of them in 3" lengths and two in 6" lengths in just a couple minutes. They stack nicely, but I might make a couple that will fold flat. Kudos on the great 3d prop, Alex!