This post will describe how I built the forms for the wallbreaker. This approach will support cheesecloth in a way that will keep it away from all the strings and moving parts. You can either use this approach or use it as a basis for your own.
Building the forms
I have made some templates you can download and use to create the cardboard pieces used in the following steps, available here. These do not have to be perfect, in fact these forms give you a starting point which will be trimmed at least once while you fit the forms to the wallbreaker and test run the motor to make sure everything clears. I used corrugated cardboard,to follow these steps you will need to cut out the number of forms specified below for each step. I also use a hot glue gun to fasten all the pieces.
Cut out the templates for the chest as shown above. The form is built using hot glue as shown in the following pictures.
The completed form is pushed onto block #19 as shown below. Run the ghost and make sure the dowels turning the head move in the slots without hitting the form. You may also need to trim away part of one of the C3 pieces so the head is able to turn freely back and forth.
Cut out and assemble the shoulder forms as shown in the following pictures. The dimensions for the large piece of cardboard are provided in the templates you can download above. Cut out the piece of cardboard, then cut slots at the shown intervals. Cut out 1 S1 and 2 S2's. S1 is glued along the middle of the large cardboard peice, with the slots sticking out to either side. Glue S1 so the short side is next to the thinner slots.
Once S1 is glued onto the shoulders, position the two S2 pieces as shown below, sliding them down over the dowels.
Next, place the shoulder assembly onto block #12 and attach it with a screw.
Now use hot glue to attach the flaps to the S2 pieces as shown below. I like to use small pieces of masking tape to hold things in place for the couple of minutes it takes for the hot glue to harden.
You will likely need to cut some out of the S2 peices where strings need to go. Make sure to check al strings, and run the ghost to make sure everything clears.
I use cardboard tubes left over from paper towels to build the arm forms. Cut out 4 of the IR2 forms, cutting the slot as shown in 2 of the 4 pieces. Cut out 2 LR2 pieces. Cut a paper towel tube in half lengthwise. You should end up with pieces as shown below.
Glue the IR2 with a notch 2-3" in from one end, and the one without a notch in about the middle. Glue the IR2 piece onto one of the center blocks at the elbow (block #8 or #9, see below). Note that I cut off one of the tabs sticking out, and I positioned LR2 so it would not hit the lower arm dowel as it moved.