Looks nice, I am not trying to bash and it may be to late, but I would have beefed up the Bottom level and foundation my self, The foundation may be ok for a one level building but a two story building it does appear to be a bit weak/undersized, there is going to be a lot of weight, once the inside is finished off and then you start adding all of the equipment, feed birds and so on. Just my thoughts and it is also hard to tell some times by Pictures, but I know that would not pass code here.