If I were to build a speaker, I would use a Heil Air Motion tweeter, a Vifa midrange, and a 12" neodymium woofer. The crossover would be a 3-way, 4th order, T-type. Crossover frequencies would be 400/2500, 94DB efficiency.
Capacitors for the midrange and tweeter would be Jentzen Superior Series Z-caps,and Solen Metallized Polypropelene for the woofer, which would be side firing.
A zebra wood finish and the project is complete.