I started a more "realistic" version a year ago for CONvergence last year.... didn't finish it.... and it's still waiting to get done. :rolleyes
I cut mine out of some solid pine (?) that was glued into a big honking plank I got from Home Depot. The raised part (that this guy doesn't have raised) I had to make out of 2 pieces of some thinner wood. Kind of hand carved the big nobby deal... it's got a long way to go.
My plan had been to make it sort of like the plans that are available online, but not use their electronics. I'm planning on using the ideas from MAKE's cigar box guitar projects: piezo speaker as a pickup, send the signal to the cracker box amplifier, and bingo bango bungo. I'd like to route out the back and have the electronics and speaker in the back, although that obviously will make it not as loud.
I'd also been planning on building an MP3 player into it, so that I could "play" it even if I wasn't any good.
I picked up the tuning pegs from a local musical instrument maker shop:
http://www.harpkit.com/Merchant2/merchant.mvc. Really neat place to visit! They also have a line of cardboard instruments - mandolin, dulcimer, guitar, ukelele that have great sound! They're cheap, and they look kinda silly, but they sound great! Some were painted up a little garishly, like a kid who built it maybe would, and some were covered in that wood grain contact paper.... which looked a lot like wood grained contact paper. But for home made cardboard guitar, they sounded great! I had been thinking of making a Vulcan harp all out of cardboard.... You'd have to make part of it from wood to take the strain of the strings, obviously, but I think it'd be a blast!
Check out MAKE's back issues, their TV show, or their website and blog for more info on the whole technology of cigar box guitars and the cracker box amplifiers. It seems the techniques could be readily adapted for making a working Vulcan harp.
http://makezine.com/ If you Googe "cigar box guitar" you'll find a lot of good info, that way, too.
I think a lot of the cigar box guitars just use twine or monofilament from hardware stores, but a lot also use real guitar strings, too. Depends on what you want.
The one the fellow on Instructables made seems a lot simpler and doable than my overly complicated "accurate" version. And no electronics to fiddle with, er, harp with.... :wacko