First, let me tank you for the advice Frosty. Much of what you say is useful, although there are some elements in there that I've answered already. A few are not applicable because of details I have not mentioned. I'll try to complete the description to answer your comments.
The main thing is that you wouldn't place the forge in a corner, but rather along one of the long walls, in order to accomodate longer stock and pieces being worked on. Unfortunately, between the windows isn't possible because that would put the chimney in the branches of a tree which is located at the bottom right corner of the new shed. I could place it near the middle of the window-less long wall, however. I think that would put the stack far enough from the branches of the tree. I am already removing one of the tree from the backyard to enlarge the shed, but city regulations wouldn't allow me to remove the other one, even if I wanted to.
About the band saw, I mistranslated the name (my primary language is French). I meant a table saw. It is actually a radial arm saw, and its table is actually that large. Yes, I know how dangerous a tool this is. I am very careful when I use it. Eventually, I will inherit my dad's extra-large table saw (36"x60") when he is no longer able to use it.
Moving the lawn mower and shop vac under the shelves frees up floor space, but eliminates some of the shelf space. I will see how this will work in practice. I am planning on shelves built on the wall with close-fitting wooden boxes to avoid dust gathering on store items.
Here's a modified layout. As I mentioned previously (several times), the anvil and vise will be moveable. I show the saw and belt sander in their location when forging.
Everything would be carefully vaccumed to remove any wood dust before I fire up the forge. I understand the need for a seperate shop vac to clean up metal dust after forging.
Is this better? (Note that the anvil and vise orientation are off, I just didn't bother realigning the graphics.)