Tools- Safety glasses, bench grinder, fine wire brush,
drill press, assorted SHARP files, hacksaw, welding
set for brazing, Dremal tool (nice to have but not
necessary), screw drivers and pliers.

During construction, I didn't use exact measurements. 
Everything was assembled by trial and error and very
little actual measuring was done.  If you find an
easier or better way of making one of the parts or
completing one of the steps feel free to do what you
like.  I offer this only as a guide.
Also, I recommend building the chassis first before
the boiler shell so the builder can adjust its length
to fit the chassis.

(Picture 2-1)
This is the steam cylinder for the rear chassis.  File
down the exhaust pipes flush with the outside edges of
the cradle.  Then file flat the small nubs on the left
and right side right above the two holes.