i did all the 2x2 edges in my pen with something plasters use on the walls to get there corners,its the metal strips that goes on the edges of the wall,very easy and very very cheap to do and easy to cut with tinsnips which is a must if your going to use it ........ill get you some pics later mate so you no what iam on about
i got mine from wickes and used the nails for roof felt with big heads and galvanised so no rust