High five for your efforts. As for me, I don't have the brains or the patience for all that, so I just paid the man $135 to send me one.
haha!
I always wish I knew more about electronics. I've done a lot of speaker crossover builds, but off other people's plans. I designed my own a few times, but was never anything impressive.
Don't know if any pics or details on the board he send will help you any, but if you want them, let me know!