Hi Emmanueld, looks like quite the structural re-build on the under side of your car! It looks like you have it up on the host whilst its been rebuilt structurally! I have been involved in many rebuilds on cars, structural and panel work, but I would advise not doing structural overhauls unless the body is held at least at 8 or more points and jigged. You could find your body now has a slight twist or warp from being un-jigged as the weight at the front and the back would have bowed the body whilst the structural components where out of the middle of the car. Make sure you watch for this whilst doing the next side. Cheers Mark