It is very easy and i spend 2-3 hours to build this gui.
It is just in experimentation.
The power of iobroker is great. I use my existing Pimatic with all Devices an iobroker for Visualisation and some extra stuff like TV-Programm. Combining both Systems i sgreat and many thanks to Bluefox for building an adapter for pimatic.
Take a look to iobroker_dot_net