David,
You made a great job of that. I think the difficult part of drawing up plans using a photograph as a reference is getting the aspect ratios reasonably correct.
I've just about finished my first N scale cardboard structure (to enter into the Stucture Contest) and am putting together a small diorama as it's setting.
Some notes for would-be scratchbuilders working from photos:-
1) Loading bays are typically about 5ft off the ground.
2) Ceiling/floor heights of multi floor buildings are typically 11ft to 12ft high.
3) Windows can be assessed from plastc models already in your possession.
4) External doors.... same as 3) above but are typically 3ft to 4ft wide and 7ft high.
I have a passion for old-time timber buildings and find a roof pitch of 45 to 47 degrees gives a pleasant roof style.
I've found that the "cerial packet" card is perfect for N gauge structures. Thanks go to Charlie, Tyson and Matthyro for introducing me to this medium.
As you are about to find out David, repetitive work like windows and doors can be a real pain in the butt, but well worth the patience to make them.
I like your innovation at how to make a water tank!!

I just instructed my wife NOT to throw out any old pens and their like!!
Shingles are my next problem. I printed out a scaled down scan of shingles but my printer didn't have the resolution to put sufficient colour into them at the size they turned out to be. (back to the think tank

)
I'm a modeller who thinks "near enough is close enough" and I suspect that printed cladding is likely to be just as aesthetic in N gauge as actual scribed or stripwood. I'll try it some day.
Do be sure to post pictures of your brewery when you've finished it (every layout should have one

) . It looks real good so far.
Errol