So, I pulled the bifold door out, it’s corresponding seals and bits.
Then, I cut the rusty floor out of the bottom.
Next, I’ll be trimming the forward side of the door opening so it’s higher. The approach angle of the bus for the left and right side will be symmetrical, with the entry’s first step is a little taller.
New door will be a one piece that opens to the outside instead. I’ll keep the air ram hinge so it can open and close, but I’ve got a couple automotive door latches to use so I can properly lock/latch the door.