Tell us about yourself!
Great instructable but perhaps you misspoke when you mentioned the window fan keeping positive pressure in the workspace. Actually negative pressure is the key. Because perfection is an absolute and therefore unattainable, there will still be air leaks between the living area and the workspace. So negative pressure will draw clean air into the workspace rather than otherwise.
Agreed on the use what's handy on site thing. And you can bet I'll remember the hardening advice, It may not be a soup can but I'll use it on something. :-) Thanks!