Hi again Hans,
Thank you for your suggestion about the Theme Builder - I'll pass it to our devteam to be contemplated further.
As for the examples of basic widgets/layout manager you pointed out - I suggest you express your interest in them by voting for the following UserVoice items:
and monitor the progress/status of each of these items.
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI