First of all - it's a great job! Nice, with a lot of light and enough space, and i love very much the connectinon (like a balcony) between tower and the main building. I would add a clock, on the main building instead of the smaaaal tower on it. So I've already voted for you on cuusoo! I would love to have such an addition to my Hogwarts castle, I feel even that it is necessary)
And that gold thing in the Trelloni's classroom is a Samovar! very russian thing) to drink hot tea.