UPDATE: Thanks to the magic of our contact form, we now know who built this and where to go for more pictures! I’ve updated the image, name, and links appropriately. Thanks David McNeely! Excellent work!

Here’s what builder David McNeely said on TechEBlog:

This is a custom guitar controller for the game Guitar Hero, modeled after a Gibson Explorer guitar, with an extra large scratch-plate for style. I gutted the real controller and put the electronic boards in the lego case, so it actually works, too.

Thanks for the tip, readers Peter and Paul!