I don't think it's too bad of deal. Looks like you might even be able to get it for $900. By the time you add up all the parts: monitor, control panel, controls, bezel, tempered glass, coin door, t-molding, power supply, wiring, wood, actual pcb; you wouldn't be saving a whole lot by doing it yourself. Don't forget your time is worth something.
On the other hand it is a fun and rewarding experience to build your own.