If you are keeping the nest box, I'd suggest removing the 2 slanted triangle side peices of the side walls and screwing HWC with washers over them for some great high up ventilationI got some hasps to put on the ramp door and the lid of the nesting box with locking carabiners to hold them closed.
The latch on the run is ridiculously flimsy also so I also got a chain and another locking carabiner to reinforce that too.