Cut an access panel in the floor or find another way?

[Meanwhile]

Cutting an access panel is still on my list. When I greased the truck Monday, I was looking at ideas of how to do it. Thoughts so far are measuring in about 3 inches from cross members and the heat shield for the after treatment and seeing what I have for space. As far as the actual cutting goes, I'm thinking drill holes in the corners and cut with a cutting wheel on an angle grinder. I've gotten side tracked this week after finding the fuel pump parts and other things I was looking for. Now there's more projects to the list.

Thank you for your input and for sharing your projects!