Okay, let’s tackle this. So William has 111 years of experience, which is incredibly rare. Typically, designers with this level of experience can charge higher rates. Considering his expertise in various fields, including architecture and sustainable design, I'd estimate his rate to be around $200 per hour. This is higher than the average designer rate, but lower than the top-end rates for experienced architects. His self-employed status also means he's likely self-motivated and efficient, which can be factored into his rate.