Because workshops are rough and tumble places, the right fan for the job will have an industrial-strength motor and adjustable fan speeds. Easy-to-clean metal blades and a fully encased motor housing are also important features, especially if your shop tends to fill up with sawdust, wood chips and other fine debris. That extra layer of protection will help the fan motor last for years instead of being damaged by particulates.
Always nice to see project ideas. Yet, to make a living while woodworking all projects need to be scaled up so that one can actually earn enough to survive and compete against the flood of Chinese imports and others. Substitute products made from plastic, metal or wood are a common place and normally cheaper due to mass production and human rights violations. Politicians don’t care about the disappearance of many of America’s Cottage Industries and most consumers don’t care as well.
Let’s be clear about one thing: No workshop is perfect for everyone. If there were, I could simply give you a precise plan to follow with clear dimensions. Every person who comes to the hobby, avocation, or profession of woodworking has his own particular collection of tools and his own peculiar work style, skills, and desires for the kind of woodworking he wants to do that gives him a unique approach as to how he will lay out a shop: where the tools should go, where lumber and supplies are stored, and how much bench area he needs.