Im fortunate, when i was looking at vans i found my fiat scudo. The previous owner had it fibreglassed throughout the whole back of van. Think he was setting up as a dog warden but then took quite ill.
Sorry i know that doesnt really help, but i think when i end up replacing van i will probably go down same route and fibre glass floor and partially up sides as well.
However the rubber matt looks a good idea. Might put one in myself, esp b4 i fit the electric motor to reel.