The timber work that is at goat level in our steading was treated when sawn with animal safe preservative ,that was 20 odd years ago , now after years of constant contact with the goats the timber has developed an nice oily type finish from the goats coats , some areas of nibbling /chewing are given a spot of cribbox . As for rubber matting we purchased a large quantity when we bred horses as well as the goats , the local equestrian supplier purchased a shipping container full in the knowledge she could sell it all , at that time it was about £11 for an 8X4 sheet, 18mm ribbed one side dots on the other, I remember it well, A wet night each sheet heavier than the last ,all sold that evening, stuff was even heavier when I unloaded it at home ! shop around and see if any local supplier is going to get a bulk order in to get a better price , we purchased extra for " just in case "