The two opens are from early Parkside kits with a rocking w-iron.
The left represents an early LNER steel open before the rings were fitted inside the sides.
The middle represents an LMS D2110 5 plank open.
The lowfit is built from an old Cambrian kit. They produced a fully detailed whitemetal skeletal kit for the LMS container chassis and used this with the lowfit body to provide another kit.