Griff,
If you intend to be an architect, you will have to be able to build an architectural model. It will be required. I have created a lot of architectural models for Lenox. (Lenox Procelain, not the heating & cooling co.:lol)
I sculpted their Lighthouse series and their great Castles of the World series. By doing those sculptures I educated myself on period styles of lighthouse design the in USA as well as domestic house style periods and European castle & cathedrals. It is quite fascinating. You will enjoy it!
For your Hogwarts, may I suggest N scale. There are figures and architectural components you will be able to purchase to help you in constructing the beast. Yes, it is a beast of a design to duplicate, but very cool, very creative.
The software used in architecture could help you with your Hogwarts. My father took all of the drawings they provided and re-drew them by hand so we could work with them as a sculpture.:eek
If you worked on the computer, it would more accurate and much easier to make changes before you go 3D.
Please use the link below to see the various architectural projects I mentioned, as well as the Hogwarts master sculpt and paint master guide.
SRS Prototyping - Home > Architecture
Good luck!
Regards,
Scott