Tarp over my tent

I usually stay on the land for about a week at a time.  We have a trailer but I sometimes like to sleep in a tent.  I have a nice large canvas tent that I set up on a wooden platform which we built in the woods.  The platform keeps the tent off the wet ground but it still gets rained on.  The tent is water-proof and does not leak but after a rain it still gets a little damp and musty inside.  I like to put a plastic tarp over the tent to help keep the inside dry.  Last Autumn I draped the tarp directly on the tent.  This worked fine at keeping the tent dry but I experienced an unexpected consequence.  The space between the tent and the tarp was irresistible to mice.  They would crawl into the space between the tent an the tarp at night and scurry mindlessly back and forth for hours.  Mice can make a surprising amount of racket.  A greater concern was the fact that the mice now felt the need (as is the way with mice) to nibble on the canvas of the tent.  I knew it would not be long before they destroyed the tent so I had to remove the tarp.  This year I decided to try the tarp again with a modification.  In order to keep the tarp from directly contacting the tent and thus creating the ideal mouse habitat, I built a framework above and around the tent out of PVC pipe on which to drape the tarp. My hope is that the large gap between the tarp and the tent would not seem so cozy to the local rodents and they would not turn it into a rodent disco like last season.  

So far, no mice.