I fixed the tilt sensor, and wailing works as it should -- a quick upward flick of the guitar neck is enough to score a wail. Assuming you wire up the two longer leads on the sensor, the sensor activates when it's lying flat with the leads pointing straight up in the air. This particular sensor has four leads; the other pair of leads is probably for the other axis of orientation, which will not be used.
I need to get some Krazy Glue to make certain parts of the project more permanent and immobile, such as the neck and the pick spring. Jerking the neck for wails tends to make it squeak and twist out of place a tiny bit. I might also make a removable backplate for the guitar since my clothes tend to get caught on the ends of the rods that hold the body together.
Compared to some of my larger go-by-the-manual projects, the guitar has a pretty decent amount of pieces. There's a lot of smaller pieces packed into a smaller space for stability, as opposed to some of those huge K'Nex projects that use the long rods and other custom pieces. I don't have an exact count and I'm probably not going to bother counting unless enough people ask.
I couldn't give an exact price on the K'Nex. You can probably browse knex.com for a kit that has enough materials, if you really want to try something like this.
Oh yeah, I actually have an archive of that A-series solderless hack. The original site has long since gone down but I can host the mirror somewhere. I'll set that up later. | 
.
![[x]Pepe[x]'s Avatar](http://www.bemanistyle.com/forum/avatars/%255Bx%255Dpepe%255Bx%255D-51888.gif?dateline=1210773009)
