[Alpha] TreeGUI

I was trying to code a gui layout and theme design program for panda3d. But there is just so many features the program must have in order to be used comfortably. I looked into all ready made gui tools - most of them are for existing gui’s and cant help me much. Then i though about inkscape, what i use a bitmap and then over lay it with rectangles? Ink scape has a full featured 2d gui adding abilities as well as naming the rectangles. I don’t know what do you guys think?

Use inkscape to draw out gui themes?