We have styled most of our forum and want to do the same to the box the take over message is shown in.
How is it possible to change the way it's displayed instead of it being the standard vBulletin error message

Your best bet is to either style the error template or create a new page template and slightly edit this mod to use it.

Can I use this addon to let guests view 3 threads (regardless of how many posts are in there) and after that block viewing permission?

Is it possible to turn off the nag notice? I already show a nag notice in forum and in other software applications.

On the no permission screen, could you please add the following function:
Ask the user if he/she wants to register and read more.
Add a YES / NO button.
If the user selects YES then take the user to the registration form.

This will further increase registration influx.

That's how the mod works...

You have to turn it on for it to show up, so yes, you can turn it off

Edit the template, add the button, it's just a link so there's nothing the mod needs feature wise.

I really like the idea of this and wondered if there was any way to have the nag notice appear as a pop-up? Thanks.

Is it possible to also have this mod prevent guests from viewing thread titles after their limit is reached?

Thanks!
Very easy to use and very effective.
Before I got many guest-readers today.
Now i got many new Members everyday.
Thanks!

Seems to work well, traffic has increased slightly and number of active (registered) users, has also gone up.

Not at this time

Quick question Ted...Will your mod affect the syndication (RSS Feed) function on my board. Example, if a non registered user subscribes to my forum's feed and they continue to browse until getting locked down. Will this non registered user still receive the feed. I'm thinking yes, but I am not 100% sure.