Like other projects i saw here, we need a simple 2D planner for Web and mobile devices.
It's main purpose is to design hydraulic or electric schemes, with symbols taken from a library.
Functionality must allow to import bitmap images, change properties, check elements properties (and not allow some operations) etc. etc.
After ends of designing, user can "Save" his project in a JSON file or this information (JSON) (or save into database) can returned back below.
(see similar project at [url removed, login to view] but easier and without 3D).
Code must be opensource and full commented.