Check out the skin Invicta, I helped them with a playlist drawer for the stick mode.
In that skin, the playlist drawer doesn't replace the regular playlist editor, instead it's just an extra playlist editor, so you still have the option which one you want to use. They can even be used at the same time.
It uses the <playlisteditor/> wasabi xml object, instead of the Wa2 playlist editor that is used as the regular standardframe editor in all skins.
the <playlisteditor/> object isn't completely bugfree since the merger of Wa2 and Wa3, but it's good enough and I'm trying to push Benski to fix it completely.
Putting the regular playlist editor in a drawer severely limits what the user can do with it, since it'll be fixed size, so it's not recommended if the skin is to be usable for everyday usage. But it's your choice.
This is one reason why skinning in Wa3 rocked so much more than skinning in Wa5 does, you could have as many playlist editors as you wanted in a skin and you could pretty much do whatever you wanted with them. Hell, even the Media Library (although not functionally as good as the current one, not at the time anyways, it ofcourse would've been, given time) contained a couple of <playlisteditor/> objects, and if you wanted to, you could mess around with the ML aswell. You could incorporate parts of it somewhere in your skin if you wanted, or move stuff around, create duplicates, merge pledit and ML into one window (already done if you wanted to in the default skin, you could play files directly from the ML if you wanted, instead of first having to move them to the pledit like now) and so on and so forth.
Sure, it also meant it opened up the possibility to make very unusable skins, but that didn't mean you _had_ to do that.
Aww how I miss Wa3.. :P