You made some progress. The main problem is that you don't use Ubuntu Trusty. There are several reasons why this is mandatory. If you have anything else, you might need to fix few things ... if you don't know how, you need to stick to manual -> Ubuntu Trusty, preferable virtual machine on the desktop.
Since you don't have it, you need to run Ubuntu on your Banana. Than, you need to start everything again and if you run into troubles, paste also the log which you will find in output/debug
For switches, add also KERNEL_ONLY="yes" if you seek kernel only. The result are .deb files which you install standard way: dpkg -i packaga_name + reboot. If everything goes O.K. it's more simple than you think
You will waste some time on this, but the good point is that you will learn something. If you want, I can add what you need to next kernel build and you don't need to do this ...