Heh, you may have overcompilcated things a tiny bit there, at least if you're only interested in the simulator. I'm not sure if that was intentional.
After the first line in your code snippet, in theory, all that should be needed for building and installing the ipod6g simulator itself is the following (the j option uses multiple threads to speed up the process):
../tools/configure --target=ipod6g --type=s && make -j10 && make fullinstall
(
Update 2024-12-19 not needed anymore)
Optionally, if you want to have the device background displayed, at the moment you then also have to manually execute (as you mentioned):cp ../uisimulator/bitmaps/UI-ipod6g.bmp UI256.bmp