Just to give you an idea of the scope of this project I figure that just in the hangar floor there are 3,600 nails that are represented by the following methodology.
-measure and decide the pattern that you will use (how far are the floor joists apart)Two nails side by side or staggered like the siding?
-Mark position of nail holes and with a hammer and a pin open a hole in the floor to represent where the nail should be.(on softer wood you may have to use a drill)
-Take a ordinary HB grafite pencil and twist it into the hole to represent the grayish-black nailhead.
-Take a very small round brush and fill each hole with watery raw umber(you may have to do this more than once to completely swell the hole shut.
-touch up as required(some nails may be more noticable than others or near the doors they may require a bit of rust using watery burnt siennna.)
And of course this has been done over a already weathered floor using acrylics and pastels.
If I spend on average just 30 seconds on each hole ,your looking at 30 hours work just to nail the hangar floor!

Ahh,but it is fun to do outside on these nice sunny days with a bottle of my favorite brew to keep me company and some good old rock and roll on the boom box(love those Harley-Davidson road songs and Bob Seger)and besides it looks so damn good when its finished.
Cheers! John.