I'm designing a new wardrobe system for my room, which will be a series of cupboards, shelves, drawers, rods, etc, taking up an entire wall of my bedroom.

I'd like to make a scale 2D diagram to show the builder what I want, including key measurements. Photoshop's a pita, it's not made for it. It can't easily do shapes that can be resized, and it can't do sizes. I considered a free CAD tool like Cadema or QCad, but the learning curve seems quite steep given the short and one off nature of what i'm doing.

Can anyone recommend another system, package, or website that would make this easier? Pen and paper might be the easiest way, but i'd prefer electronic if it's not too difficult.