Okay, first I want to thank MageGuru for his AWESOME tutorial and lynchknot for his AWESOME themes.
But after playing around I noticed some bugs in them, first the "round bar" issue with WB4. So here is a fix:
1- close phoenix
2- download scrollbars.css
3- open safNB.jar in C:\Documents and Settings\[you login name here]\Application Data\Phoenix\Profiles\default\[something].slt\chrome (nb: safNB.jar is the Non skinned scrollbars theme)
4- go in \global\ and replace the scrollbars.css with this new one.
5- restart phoenix, you're done !
Then, the compact menu issue, here's a fix too:
1- close phoenix
2- go to http://cdn.mozdev.org/compact/ and install it.
3- replace the compact.jar file in C:\Documents and Settings\[you login name here]\Application Data\Phoenix\Profiles\default\[something].slt\chrome or C:\Program Files\phoenix\chrome with this one (it's actually the original file with the MageGuru's icons and the MageGuru compact.css file fixed by me)
4- restart phoenix, done.
After fixing this, I got this:

you see under the toolbar, there is unused space, to fix this, click on compact menu, then View > Toolbars then uncheck Navigation Toolbar and Bookmarks Toolbar, and you should obtain this:
Hope you'll succeed.
siwu
EDIT:
For those who have and Aqua style with WB4, and have a "titlebar issue", download the iSkin by judge, open wbconfig and choose the Per Application Setting, select phoenix and choose: Skin titlebar only.
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