Hi Cyrus, It was never my intention that the mast be in two pieces. I have looked at Drawing 2 and don't find where you see a suggestion that it be in two pieces. There are two mast sections on the left side of the drawing, the larger one applying to the mast between the deck and the hounds. Above that it tapers to the smaller section, applying at the masthead. The right side of the drawing you can see where it must be hollow and where it must be solid. If you build the upper section separately to the smaller section and slide it into the top of the larger section you will split the mast due to headstay and peak halliard loads.
Taper all of the staves to reduce them from the 43mm width down to the 32mm width shown, for the length from hounds to masthead, before cutting the birdsmouth V. When you glue the mast it will pull the staves together to form the taper.
DD