Step 1: Starting the Quest
Search the bookshelf.
Go to the workshop.
Get 3 elemental ores and 1 clay.
Make the key mould
Make the key

Begin the quest by searching the bookshelf in the church south of the Seers' Village bank. You will receive a Ragged book detailing elemental experiments done by Vitruvius. With your Battered key, head down to the Elemental Workshop. Go west into the earth room, kill three Earth elementals (Attempt to mine the Elemental rock's) for the Elemental ore and mine one clay. Run back to the center, then North to the water room and use the nearby bucket on the sink, and use that bucket of water on your clay. Use the soft clay on the Ragged book (must of read the book for it to work) to receive the Key mould you need to open the Body door.

Head South to the fire room, and use your elemental ores on the furnace to receive three Elemental bars. With the mould in your inventory, use one bar on the furnace to receive a Ragged elemental key. This can be used to open the Body door on the bottom floor of the workshop.

Step 2: Through the Door
Create a Primed bar.
Enter the Body door.

Before you enter the Body room, you will need to make two Primed bars using the machinery from Elemental Workshop II, the machinery can be found by descending the stair case found in the enter of the first floor. Place your Elemental bar on the Jig cart (Picture), operate the western claw lever to lower the claw and raise it back up. Operate the eastern lever to move it over the lava. Then lower the bar into the lava, raise it back up, and place it on the cart. Operate the central lever to move the cart to the press, then operate the press lever.

Bring the cart to the water tank. Operate the normal lever to open the door, the corkscrew lever twice to pull the cart into the tank, then close the door. Open the western water valve, and close the eastern valve, then close the western valve and open the eastern valve. This process may not work the first time depending on the current state of the water tank. If the process has worked your bar will have turned a shade of purple/blue, if not repeat the valve process. Bring the cart to the fan, and turn it on and back off. Finally, bring the cart back under the crane to retrieve your Primed bar. Repeat this process again for your final Elemental bar.

Head downstairs and use your Elemental key to enter the Body door.

Step 3: Inside the Room
Put the primed bar in the slot.
Complete the puzzle.
Charge the bar with Body energy
Repeat for second bar
Make Body body

Inside, use your primed bar on the slot near the small room. Go down the stairs and begin the puzzle.

The puzzle consists of four parts that allow you to lower all of the raised mechanisms. There are levers all around the grid, plus two larger levers to the north of it. The western lever is the "Reset lever" and will reset all of your moves to the beginning. The eastern lever is the "Undo lever" and will undo the last move you made.

To complete the grid, follow these instructions using the levers labeled A to F and 1 to 7 (see Picture):

Part One (lowering the mid-drive slider):
C, 2, F, 6, C, 2, F, 6, C, 2, E, 5, B, 3, F, 2, B, 3, F, 2, E, 4, F, 2

Now hit the "Reset lever" before beginning Part Two.

Part Two (lowering the high-drive slider):
2, B, 6, A, 5, C, 4, B, 2, C, 5, F, 2, C, 5, B, 6, C, 4, B, 5, C, 3, B, 5, E, 6, F, 2, B, 3, C, 2, B, 6, F, 3, E, 5, F, 4, E

Once again, hit the "Reset lever" before moving on.

Part Three (breaking the counter for infinite moves):
3 B 2 A 3 B 5 E 2 D 3 E 2 B 3 F 2 C 3 F 2 C 5 F 2 E

Do NOT hit the "Reset lever." Move straight on to Part Four.

Part Four (lowering the machine):
F 6 A 5 C 4 B 6 F 5 B 2 F 5 C 2 F 5 C 2 E 6 C 2 E 3 C 2 F 6 B 4 C 3 E 5

Part Five (powering then raising the machine):
3 C 4 B C 3 E 5

When the powered machine is raised, go upstairs and enter the control room. The big red button will now be activated. Pull the lever and press the button, and the Primed bar you inserted into the slot will be charged with Body energy, while draining your Defence drastically. Pull the lever to open the door and take the Body bar out of the slot. Insert your second Primed bar into the slot and go back downstairs to charge the machine again, following Parts 6 to 8.

From this point onwards, these steps can be repeated to make more Body bars (do not reset or you will have to start from part 3 again):

Part Six (lowering the machine again):
4 5

Part Seven (powering the machine again):
3 C 4 B

Part Eight (raising the machine again):
C 3 E 5

Go back upstairs and charge the Primed bar with Body energy. Once you have both Body bars, go upstairs to the top floor of the Elemental workshop, use a Body bar on a workbench in the middle room and choose to make a Body body with the Slashed book and Ragged book in your inventory. Congratulations, quest complete!