Do the same as you did before, copy the mojoportal-complete.sln file to a different folder and rename it to some custom name like my-mojo.sln
Next put it the new named file back in the root folder where you copied it from and open it in VS 2008, now you can remove projects you don't want.
Be sure and create a user.config file, use a text editor like notepad to open user.config.sample and save it as user.config
Now you can put your connection string and other things from the appSettings section of Web.config into user.config, since you user.config is not under source control it will never lose your customizations, see the Web.config Guide for moree info
Doing the above steps will make it easier for you to do SVN update to get the latest mojoportal without losing any of your settings.
Set your connection string, rebuild the solution.
Let me know if you get errors.
Hope it helps,