I did make some changes to skinLF, one would need those.
And I did change some of the LimeWire source to make it work with SkinLF. It wasn't a one line switch, about 7 .java files needed editing of some sort.

Also, there are also a couple changes that have nothing to do with the skin, such as stats in the titlebar and connection screen even for leaf connections. Plus, the retro version screwed around with stuff to make the layout look like it used to.

So yeah, the source code IS the limewire Sourcecode, plus about 10 files that are changed to some degree. I'll happily send it to anyone that asks.