@bucknall Thanks for following up on this. For trials, the pytrack would be mounted in a car. The pysense is indoors, wall mounted. I'm in the process of 3D printing a casing myself for this.
But as a review I can add that an enclosure similar to Pycase Clear, which is able to house the Pysense and Pytrack boards, would be a best suited solution.
I have seen in TI SensorTags that they have transparent casing pieces on top of the sensor side of the board with slits and grids to let both light and humidity in. Perhaps this is also something to consider in the design.