First you should mount the Soulplates under the shell. Therefore you should receive 11 screws and 11 T-Nuts (counter parts). First you should sort the screws. The short ones for the front-soulplates and the long ones for the rear-soulplates.
VERY IMPORTANT: Between the soulplates and the shell you have to put the UFS T-Nuts (counter parts) to mount the frames later on. After the soulplates are completely fixed it is not possible to put the UFS T-Nuts between the shell and the soulplates.
Now you can fix the soulplates. Therefore you need to put the small counter parts into the holes from inside the shell.
Please note: The "backslideplate"-screw is not the same as all other short screws. The screwhead is not rounded.