Check also maritime plywood. If you work with a CNC factory they can do joints and (I know about 3 different types of joints they make previous of) finishings with venners the way you want. They also work with MDF and plywood. The phenolic boards might work well, if well insulated against vibration (this is only my guess). There are plenty of colours and finishings. There are plenty of boards they use for outside, including maritime ply and phenolic, in construction.