@Maverick welcome aboard:
I’ll try to answer some of your questions but most your answers can be found on the forum itself, its just a matter of searching it per your requirement
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this can be addressed here
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was documented here
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the OSA810 is the camera module supported officially by khadas
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UART GPS module tested here
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Android will not run on external storage (due to bootloader reasons)
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LTE has been tested to work on Android pie, AOSP should support (most likely, need more proof)
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VIM3 is a much less power hungry device, more efficient, and performant, better for a smaller more compact handheld device.
hope this helps, please ask Terry or goenjoy for any extra advice,
best of luck on your project
cheers!