I am having the same issue. It seems like there is something holding the space open on the right side of the header area that is overriding the code changes Schorsch has made, which also work for me as he describes.
The header will not extend to the full defined width & height.
I love this theme but would like to fix this among other things related to the sidebars, grid & menu. I will search further on these issues before posting in the applicable location.
Thanks!