I have to say that it doesn't look much like any mediaeval building I've ever seen, and we still have a few in England despite the efforts of the Luftwaffe and modern architects. The tiles appear to be Roman or Mediterranean style. I'd prefer to see plain clay tyles or maybe thatch. They also need thickness. I agree with the other comments - take a look at a few books on mediaeval (sorry, I tried spelling it the American way but I went into severe withdrawal symptoms, so reverted to the English version) architecture and include all the details. Even in the old days buildings had to be built properly or they fell down. Keep at it, you'll get there in the end. Cheers, Maz