Pekwm looks very interesting and already has some magnificent window themes that would go very nicely with some of my skins (I’m thinking the OSX-style in particular). It’s not too dissimilar from Openbox, though the config files are different, but it may be possible to offer a skin with a choice of window manager..?
My current problem with Pekwm is that the window decorations are not rendering properly. There is a known issue with Nvidia graphics drivers and my laptop is indeed using an Nvidia card. Unfortunately the documented work-around doesn’t work, so more testing is needed before it becomes a default app.