Remember the top of the septum is part of the cartilage on the bridge of the nose and the bottom is the top of the pallet inside the mouth.
After the septum is fitting properly, secure it inside the nose with sculpall type or body filler (Bondo replacement). Then you will need to carve out the part in the form where the excess on back of the septum goes into the form.
When this fits, bondo the nose back in place using the guidelines made before cutting the nose off. When the body filler has set some, but is still warm and somewhat soft, remove the excess and cut in your lip slots, this is much easier before the filler has completely set hard.
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