Extremely fragile seems problematic. What is the adaptation if scouted and opponent seems to realize what is up?
Depends on the map.
Berber player would have to transition from heavy wood-vil sustaining food to farms to get up, way behind. I typically go for it anyway if scouted but it has a much greater chance of failing.
Other player can wall, or plan safe res/contingency.
I think i'm most happy when I see a rax being built as my vils stroll past it, effectively wasting 175 wood. So wonderfully delightful to give a nice middle finger to the standard meta Drush/M@A builds.