Folded rear flange into step box.  This abuts the floor at door level.  Stripped rotted steel panels from step frame.

Cut steel for side and back of step bay and put 90 deg fold in to from the shape.  The top side needs to be flanged to meet the floor.

Here are the parts that form the entrance step box:

Adding the strengthening flange to the end piece. Rearward end and back.

Forward side piece.

Cut steel for front bulkhead side of steps.