Building Custom Speakers?

Anyone know anything, or have any experiance with building your own speakers?

I was thinking of having a go at it in the summer (after exams), only problem is I have no idea what i'd be doing.
Wirings not a problem, I understand how to wire speakers up to an amp etc. but when it comes to inside the speaker, i'm pretty lost. Does anyone know what crossovers to use when etc, and which are good.

Anyway if anyone has done it before, would'ya show us your efforts?

http://downloads.bbc.co.uk/rd/pubs/reports/1976-29.pdf wiring

look up rodgers bbc reference. These are more monitors.