The new tub (chassis) was done shortly before I bought the car. The previous owner had a crash and it was quicker to replace the tub in order for him to make the next race. He told me it could have been fixed by a body shop but would take too long and make him miss the next race. So he opted to have the new tub and move all of the good parts to the new tub/chassis. Essentially it is getting a new car from Porsche Motorsports but the engine/gearbox/etc is transferred to the new chassis from the old one.
It is much better than repairing a damaged chassis in most cases.