Are you brewing with propane/Natural Gas, or electric? That will make a big difference in the ventilation department. Ventilation is good, but not crucial for electric brewing as you aren't burning anything and you only produce 'harmless' steam. You are however with burners and you would need to build a ventilation hood over your kettles to draw out CO and such. I'm not sure of the CFM requirements for this, but you can pick up exhaust hoods relatively cheaply at places like ikea...or make your own hood out of material of choice and plumb it to a ventilation motor that vents outside. Happy brewing!
No rodent problems but yea, I would make sure everything is rodent proof. One of my concerns is that everything will be out in the elements for the most part. Protected from rain/snow and such but it'll be just as cold or hot in there as it is outside.
I guess I am trying to find a way to utalize my space...
Beer is proof that God loves us and wants us to be happy!
For a bigger long term project, you could insulate the walls, floor, and ceiling, add a small AC unit, and basically turn the whole shed into a walk-in. It would take alot of time, but wouldn't be particularly expensive.
Primary #1 - Oktoberfest
Primary #2 - Chamomile Honey Wheat
Primary #3 - EMPTY!
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Coffee Vanilla Stout
Keg #2 - Fall of the Ukraine Baltic Porter (lagering in keg)
Keg #3 - EMPTY!
Bottled - NONE!