Use the 4.7 screen but use the form factor of a hand held radio.
- In this version you keep gps, map, and ham and make the antenna more a whip. Drop the solar back but make the battery compartment much bigger and bulkier with the ability to swap up a battery quickly.
Use a 13" screen (yup its bigger but people will like it) - make this more of a map system keep gps, map, and solar. Drop the ham functions. You can make the case have a handle and be bulky more as a protection.
The 13" screen would be able to produce faster since you dont have to deal with ham specifications. You can also add ham ability by using a Bluetooth system.
I have gave up my right to have a strong opinion on this when I asked for my refund 15 days ago but I still wish for this project to succeed.