Hack CB for custom registrations

I have 3 types of users on my site:

1. Personal
2. Golf businesses
3. Golf courses

I've been hoping to have a separate registration for each one. People get confused and type in data for a course even though they're a personal profile etc...

I'm thinking that duplicating the registers task in the CB file and creating

task=registerpersonal
task=registerbusiness
task=registercourse

and then asking the person when they sign up which one they are. Then if they click on golf course, I can call up the task=registercourse and the custom fields for that will be displayed. I could use my server's URL redirect to send task=registers to the page which they select what type of member they'll be. OR change task=registers to redirect to the page which asks them. Make sense?

Which files do I need to modify the code? Or would this be SO difficult that it's not worth it?