Well... this is one step further to a board I had imagined. What if you had instead the 2560? The reason for that is that you'll want to basically use this board as a server and master of a network of remote devices. So, the html needed to make the webserver show something nice will eat into the program to control different and several devices. It is possible, but a 2560, for the capacity alone would make it a better solution for big things.
Nice work...
I might buy myself a ince Christmas present. 