EPS / SIP Sandwich Panel Engineering for Specialized Use

Hello, I'm in search of help designing a EPS / SIP sandwich panel to be used in the manufacturing of one piece inground swimming pools. The panel would likely use polystyrene foam with steel or aluminum structural members and a metal skin and/or polypropylene skin. I have experience in the pool industry and do not need assistance with any of the hydraulic requirements, structural/mechanical engineering help only.