For thickness of panel from 75 mm. change 100mm Due to add 1 layer is glass wool and gypsum board. And from Mass rules, If add a 1 layer for absorbing sound. It can absorb the sound increases about 6 dBA. I send revised quotation to you. I can get you a special price, because Structure and Size panel made more difficult.
If you have further questions, Please contact me. Thank you very much.