Custom Connectivity Case Design

I need an industrial DFM product designer who can take inspiration from an product that is available on the market and help me create a brand new functional design from it. The end product will be simialr in concept, an off the shelf waterproof enclosure (likely the nanuk 935) and a collection of batteries, starlink mini and 5G routers antennas. What i need help with is the functional design of the ingternal monts and assemblies.

Deliverables will be full 3d models and designs for the internal assemblies.