Some sort of lock for cabinet doors while traveling, like the shower doors have
Better cabinet latches
Easier way to install LTE antennas on the roof, like a place to mount it, a junction box, or some way to drop cables down without having to drill a big hole through the roof
Dual thermostats, so both ACs can run on thermostat
Access pass through storage from inside
Dead space should be AGAINST YOUR RELIGION!
Drop the carpet. All of it. If you are going to have carpet anywhere, you should at least avoid it under the dining table, or anywhere in the kitchen.