Hi,
Here are the directions for how to do the trapunto type sausage curls on my doll. All though it is not 'true' trapunto the effect is almost the same. I will do a real trapunto technique when I get better at this. This is only my first!!
Here is a cloth on that I am working on the pattern and an example of sausage curls.
http://www.heirlooms4tomorrow.com/clothchinahair.htm
Please excuse the crude pictures. I made them in 'paintbrush' and I am not very proficient with that! I hope these directions are clear enough for you! If not, please email me!!
Okay.... for materials. I used muslin (Springmaid's tremode flesh color) and cotton fleece. I got both at Sister's and daughters. it would be cool to use a hair color.
The fleece is like the kind you use to quilt placemats with or the kind they are using for snowmen now. It is about 1/8 to 1/4 inch thick and not puffy like batting.
For a needle I used a small curved one but you can use any needle and use hemostats or needle-nosed pliers to pull the needle out of tight spots like around the neck.
Matching thread
pencil (chalk or soap for dark fabric)
tissue paper or tracing paper
2 rubber bands that will fit around head
Hemostats or needle-nosed pliers
With the doll facing you, lightly draw the front hairline to a length you want it.....then draw the back hairline. I used a pencil but some of the new-fangled pens that erase will do too. Try not to make the curves too sharp.
Lay a piece of tissue paper over the face and trace the front hairline (shown in red on the picture). Cut out this template.
Lay the template on the bias of the fabric you want to use and leave as a seam the depth of this particular hairline. Mark with chalk, soap or pencil.
Cut the fabric beyond the mark: Measure, the length of head from the front of hairline to back of the neckline + 2 inches. (In red below) Square it off and cut it.
You might have to cut some off later but it's better to have more fabric than less!!
Lay the 'right' sides of the fabric together, matching the lines of the doll with the fabric you just made. I took pins and put them through the points of the mark and matched them with the marks of the doll and laid it down. The doll will look like it has its face covered.
With matching thread, stitch tiny backstitches across the line.
How to do a backstitch:
http://www.stitchguide.com/pages/emb_backstitch.html
Lay a piece of fleece or light quilt batting on top of the doll's head and trim to match the front hairline. Don't worry about being perfect! Then cut the fleece to the size you want: down to the top of where you want the sausages to begin. (in red) You can mark the area where the sausages begin if it makes it easier. Baste the fleece in place.
Turn the fabric up over the head and push the fleece up against the hairline in front. If the points of your curves are not as sharp as you want on the hairline, pull the fabric up and take small tiny stitches there to hold it in place. Otherwise, pull the fabric smooth over the fleece and pin just below the fleece. You should be able to feel and see the fleece under the fabric.
Fold the fabric down the sides (either side of the face).
Invisible Stitch in place. Stopping where you drew the bottom line. 
Back stitch around the fleece line/top of sausages--all the way around the head.
Looks cool huh?...LOL.. looks like a shepherd.
Making the sausage areas:
Pull the down fabric neatly and evenly distribute it -- use 2 rubber bands to hold it in place (in blue below). Mark off the number sausages you want.(in red below) I started on one side and worked to the other. Try to keep them uniform. I did 8 sausages but my doll is small.
Backstitch down each of the sausage marks until you are 1/4 inch from the line you drew.
You will have folds and creases in the fabric as you sew but if you gather it slightly as you backstitch it will look like folds in the curls.
Making the rolls of fleece to put in the sausages:
Cut fleece in strips a tad longer, (I used about 1/8" longer but for a larger doll you might want 1/4"), than the sausages and long enough to give them a few turns/rolls. Make sure when you put them in, the sausages puff out...if not, cut them longer and if too small, cut them shorter.
Stuff one in each of the sausages with the hemostats by squeezing the whole roll lengthwise into the jaws of the hemostats and inserting it..
Finishing the bottom:
Turn the fabric underneath the sausages and blind stitch in place. You will have to trim the fabric first to get it under. I can't really tell you how much to trim because of the size of your sausages....they are all different. Just trim it so it turns under nicely.
Try to round off the individual sausages on the bottom as you sew. Pinning it in place really helps to be uniform.
I hope these directions are clear enough for you! If not, please email me!!