Basses built with a uke scale length of 21 inches.
This bass is a 21" scale, with a piezo saddle mounted in an adjustable bridge. The soundhole is just for looks. The strings are metal-wound Kalas. The fretboard is cut out of the ugliest piece of wood I ever received. For such a small neck, I managed to cut around most of the ugly, and the result isn't half bad.
More: Audiovox Uke Bass ...
More: Bass Projects ...
I have several hand drills, cordless and corded. For real work, a massive DeWalt cordless powers easily through concrete. But you don't need all that to build a guitar, in fact, you don't even want it. The DeWalt is expensive and weighs a ton. For light use, a little cordless Ryobi or Black&Decker will do just fine and is a lot lighter on the arm and the wallet.
More: Hand Drill ...