The is the ACP+ is a wonderful project for beginner's.  It an excellent first  DIY preamplifier and headphone amplifier.  People love it when paired with any of the the Amp Camp amplifiers to make a complete first-build system.  It doesn't even require a chassis.  Everything you need can be purchased in one kit and assembled in an afternoon.  The performance and sound are exceptional, as you'd expect from a Nelson Pass design.

Photos of Poet's DIY ACP+

The photo on the right (taken by Thuss + Farrell) is an ACP+ with all parts chosen, stuffed, and soldered by Patrick Farrell's 10-year-old daughter, Poet. It demonstrates the beauty of a completely do-it-yourself ACP+ with a colorful parts selection. 

Note - As mentioned, not all the parts shown in the photo are sold by the diyAudio Store.  Please review each product to see what's included in your kit.