Bike trailer frame for conversion (IP3)

Red, possibly Trixie make. It's been in the loft for years, all parts there but in need of serious tlc. Frame is aluminium,I think, not rusty. Cover is in tatters. I used it to transport 1 small collie and 3 Cavaliers. It was a bit of a squash. I reinforced the sides with metal mesh panels as they weren't keen.