So the idea is really good, first I will do some small updates on the current design to prepare it for assembly with an SMD machine.
SSD, M2, or such drive would require a bigger design change, but this point is on the improvement list, thanks for the feedback!
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.
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.
The 12v power is connector, is that a common style connector with leads that can run from a battery pack with say a car style cigarette lighter socket on ?
The input connector is an XT60 type, such a connector is needed because the board can handle 15A, and a usual DC jack (2,5mm/5,5mm) can carry only 5A.
I have quickly checked on Amazon and there is XT60 to cigarette lighter cable.