Yes I can see it when I zoom in. Useful space you've got there. Maybe work bench and shelving on the right, brew on the left and seal the wall as best as possible with pvu glue/water mix? You say you don't want to draw attention - what are you going to do about lighting? Short of having the door open (and therefore people seeing what is going on) I can't see what you would do? How close do you live? Are you going to beef up locks? The only reason I ask is if you fill the space with expensive shiny brew stuff and have to expose that on a brew day there are unscrupulous sorts everywhere. It's an exiting project, and one I have considered here. My problem is the entrenched Guinness/Harp culture!!
Lighting - well, that's one reason for painting everything white actually - to brighten as much as possible.
And also, I saw this stuff a while back and I think it will work in conjunction with a 12V car/caravan battery
http://www.amazon.co.uk/dp/B007O4I34U/?tag=skimlinks_replacement-20
Seems like that's 24W, which as 12V is 2amps. Looking at a pair of deep cycle batteries that are rated 7Ah, so lets say you can safely use 3/4 of that 14Ah = 10 hours of continuous running
I have a solar panel that I'll put up on the roof to keep the battery charged - as I'll only be brewing / bottling once a week, I think it will be fine
I'm also planning on running the extraction fan system off the same power - maybe bigger batteries will be best!
Edit: I think one of these 12cm fans on each airbrick will do the trick very well, only use 1.2A between then as well.
http://www.ebay.co.uk/itm/gi-DC-12V...743?pt=LH_DefaultDomain_3&hash=item2a4f742b3f
I will have the door rolled up somewhat I think - maybe for ventilation. For the time being, there will only be one shiny pot in there. Later on, I'll need a masher too, but could go with a cooler-box style one at this stage, I think.
Layout plan is for a sink (which I've got for free) on a frame on the right as you enter - as I can run a pipe down the drive where there is a useful drain.
Boiler/burner in the middle, at the back - with the air vents at either side
FVs on the left - away from external walls for heat control - also, possibly inside a filled back, again, more temp control.