Hi Paul,
First start with the castings and lay them all out. Do not glue them, even if they are broken. The most important thing is color and any glue will seal the plaster and not let the paint soak in.
I started with a mix of 20 percent yellow orche and 60 percent raw sienna then a spot of transparent oxide red and raw umber... experiment with these if you want more brown red then use more transparent oxide red OR
Burnt umber or even burnt sienna.
Transparent oxide red:
Burnt Umber
R
Raw umber:
Yellow Orchre
Raw Sienna:
I use Artist acrylics. Start with light colors and lots of water, you can always go darker but not lighter!
So go slow and keep staining the plaster as you see fit. Let the color coat dry.
Then wash it with diluted mars black. Go easy with the black... again it gets dark really quick.
Let this dry for a couple of hours. Than you can powder it with white plaster or dry brush it with Titanium white
Now glue your sides together and use a square! The only building that drove me nuts was the Trackside Tavern... not one square wall in the bunch.
You will notice that you will need sand the walls square. You can do this Before or After paint. Just make sure you are sanding the ends that DO NOT have patterns on them and sand them by laying the sand paper face up on a flat board or floor.
I use Elmers wood glue with masking tape for the corners ( small buildings), or basswood for taller the buildings. The masking tape helps tack weld the corners until the glue can dry. Once you have all four walls up and things look good I use rubber bands around the walls to close the gaps. If you have a hole patch it and use some touch up paint.
The signs I put on next and that takes some practice....
To achieve the melted into the brick painted on sign I cut out the sign and use sand paper to sand the back of the sign. Until you can almost see the color come through from the front... then I dip it in water, apply some white elmers glue and apply it to the building. VERY gently with you finger nail nestle the sign into the brick or stone detail. Make sure its straight.
Let dry for an hour then use the same paint mix for the brick and gently paint a bit over it. This will make it look the sign is faded.
Next I paint the windows and apply the acetate in the windows and finish the kit per the instructions.