They certainly look flimsy. They also look ponderous and slow, which will be down to many things, not least the lack of noise. The whole idea of racing around streets I understand, but the tracks mostly seem thrown together. The London event was appalling, too narrow, to tight, to slow, bad viewing, who is organising this crap. They could have done so much more with this than they are doing at the moment. Start by removing the wings and trying to make them look like single seaters of current series.