Subs are one thing, they can be very simple to make in terms of a sealed box, but can get more complex with other designs (and many of those designs are on the internet to duplicate, too, after someone has done the design/modeling. A speaker with multiple drivers and horns and crossovers complicates things quite a bit....maybe someone will volunteer to model something for you. You'll probably at least have to come up with the drivers you'd like to utilize....