We had our tunnels setup so that they could be moved with our geodesic dome. In order for them run of tunnels to flex with this movement, we had to have a small amount of gap between the tunnel pieces. Sometimes when we would move the tunnel, we would fail to tighten up the gaps by compressing the sections together. The skunks found these small gaps and made their way to the coop. This only happened a few times. The skunks do not bother the chickens, they are after their eggs, but the chickens will raise a ruckus when the skunk is in there.
The mesh floor is to give structure to the whole structure. Keeping in mind that I designed this method so that the sections could be moved, added and replaced. I see no reason your idea would not work. The key would be to ensure that you can full affix the edge to the ground so that they cannot slip under. Depending on if you are planning to move your tunnel around, this maybe an easy or hard thing. Some fabric staples or even some stakes with eyelets or something might work to hold the edge down. I am curious though when you say metal hoops and stapleing. Do you mean hoops as the arch structure and then attaching wood rails between the hoops and then stapling to the wood? If so, then yes, this should work. You would need a bottom rail for attachment and securing to the ground.
In then end, this was a project that I had to execute quickly and with almost no budget, lol. So I kept with the KISS principle.

There are lots of other ideas out there for chicken tunnels, so dont be afraid to do some searching for google images of "
chicken tunnels". You will notice that my design is not unique, Many others have built very similar if not the same design.
Let me know if you have any other questions.