Step 1. List cabinet on craigslist.
Step 2. Buy cabinet with horn
Seriously, modding a particle board cab with 20 dollar chinese drivers? Talk about your waste of time. You'll kill what little resale value it has and possibly ruin it.
It won't really even be valid practice to be honest since the material of quality cabs is much different.
If you want to practice, buy a sheet of 4x8 Arauco from lowes for like 25 bucks and get to work building your own cabinet
