Hi BigRed!
Can I see the result of ​ifconfig ​BEFORE starting mana, and the contents of ​start-nat-simple.sh ​and ​hostapd-mana.config ​please?

Can I also see a screenshot of Kali’s network settings please?
So just right click the Kali machine in Virtual Box >> Setting >> Network, take a screenshot and post it here please.​​​
Also can you please give me the exact model of your adapter?

Thanks!
Diego