The tube is around 1mm thick so its not very strong. It's not there for strengthening. Its used to mount the wings etc
I don't think there's supposed to be anything reinforcing-like ahead of the turrents, regulations-wise. I nearly commented on it myself, but wanted to see things get a bit further down the line, in case it was a 'show car' or some other such rubbish.
We are hoping to compete with it but not sure what in at the moment.
Not building to regulations, just building: FAIL.