Supposedly I'm not supposed to laugh, but HDR-machine, it does not work. It would be wonderful if time machine would be so simple (and cheap) to build but it is not.
To build the time machine you will (most likely) need to have ability to understand complex physical equations or someone who does. Also you would most likely need damn huuge amounts of energy to power the thing, not to mention sh**load of money to to build it and design it in the first place.
Of course I might be wrong about energy and about designing the thing, but deep ability to understand physics and equations&math, would be a start.
I personally believe that building time machine is possible, but It wouldn't be as much of time machine rather Alternative Timeline Machine.