Psamathe wrote: 1. Add an external Wi-Fi antenna (signal strength seems an issue for my RPi inside a case

That is a good idea, but unfortunately, currently, the Raspberry design has no option to connect an external antenna, maybe to hack the RPi would be possible, but one of the main points was during the development is to use the RPi as is, then everybody can attach it.

2. Fan location/position: dew falls downwards so ensure the airflow is drawing in from underside and expelled ideally through a side?

That is a really good point, currently, the GPS and the fan are on the same side, and to use the internal GPS antenna the top of the box should point upwards.

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