Interesting video but scrap the background music!

I was surprised the side tubs didn't have at least one additional forming rib at the mid point. What does the tub weigh at this point in the construction before any suspension is added to it?

Is this a RCR chassis?

Top marks for the symphony in "alew-mini-um" but the music ruins the vid. Make the visual a bit longer and try Reval's "Balaro" to better dignify The most wonderful car in fabled history of Motorsport...