I cut mine the same as redneck ,and drilled a few holes to combat condensation -beddings bone dry I top it up every other weekend. Also screwed a piece of wood at the front,one bitch is a chewer lol.always built ply boxes but they get chewed and end up stinking of piss etc,barrels Are the way forward imo wish I got on them years ago.think I payed 26 pound for 3 posted.atb dc