I agree. It will involve drilling out the pop rivets holding down the baggage floors, and removing those two floor pieces and the tunnel cover. Not difficult if you have ever drilled out those type of rivets: Just don't booger-up the holes. The rest is somewhat straight forward.Putting the steps in isn’t particularly hard Figs. But you’ll need to get access to the ribs under the baggage floor though. That sounds like the hardest part for you. I’ll see if I can figure out how to attach a drawing of the assembly.
Here ya' go: