I took the original plan design for a Murphy bed - it was inspired by a Dr. Who themed bed that used a Murphy Bed Kit - I've used Ana White's plans before and thought why spend $$$ on a kit when you don't have to. I few trips to the store and a weekend later I have my very own Tardis Murphy Bed. It cost about $140 to build not including the mattress and accessories cost (light kit/upholstery panel/police box sign etc) I raised it up about 4" to attach legs and added some puck lights for a lighting effect. I think it came together rather nicely. I just have to add handles and the magnetic closures and it will be all done.
It took me all weekend to build by myself - had my brother help me with mounting the mattress box in the cabinet. I would suggest having wood cut at the lumbar yard as it is difficult to cut the 8 and 12" boards unless you have a bigger table saw that I do.