Here are the installation instructions https://www.vansaircraft.com/pdf/step_instructions.pdf
See this thread http://www.vansairforce.com/communit...d.php?t=134249
The steps had an issue with cracking. You can send yours to Russ, who manufactures them for Vans, and he will weld a reinforcement on to them to help prevent this issue. I would do this now before installation because otherwise you will almost surely have a cracking issue later. My right side step had started to crack before first flight! For now I am just watching to see if the crack gets bigger.
If you have the reinforcement done you should hopefully never need to remove them later, negating the need for inspection holes. Nothing wrong with removable baggage floor or inspection hole, just one more thing that adds time and complexity to the build.
I would certainly install them if for no other reason that they help reduce the chances of a foot landing on a flap.