I would expect that it works to drill holes. But it you still need motors, electronics, and software. The unit for $225 is closer to working but has no software.I love it. But cant buy it, coz I'm in india. I'll try DIYing it, inspiring by utube, will be hard though I'll give it a try.
I know you want to DIY it but I just wanted to point out theat the $99 unit was just the starting place.
3v0