If all of the phone components/hardware came in a ready to build box, I would definitely follow the instructions and give this a shot. Otherwise, looks like a lot of overhead just trying to gather all the parts together. Cool nonetheless.
I've tried to source the components using as few vendors as possible (currently DigiKey, SparkFun, and Arduino, plus ordering the PCB) but it's definitely more work than just buying a kit. I'm working on a better solution but it's probably a ways off.
Not sure about DK/SF, but Mouser lets you make public project BOM lists so users can just one click and purchase all the components.