DIY French Porteur

 Spotted in the 10ème, this bike amused me with its custom front and rear racks. I'm not certain how either of them are used, but there's no doubt they're custom made for SOMETHING!

The general view of the bike

Do the pushpins say ART.CASS?

 Here's how the rear rack attaches to the seat stays. The blue bungies are just on one side.