Need help on a 'simple' louvre

Working on a bimetal louvre for a building construction class. The idea is that the louvres will react to heat and be able to close to provide automated solar shading.

The definition works the way I want, however I would like to add one more feature that I am unable to figure out. I want the 'middle line' to be able to vary in its z-location according to an input (in this case, a sine curve). See the Screenshot for an illustrated explanation.

I am new to grasshopper and any help would be greatly appreciated.

cheers,

Ken