Hi,
With Unity3d I am working for the last 2 years.
I have experience integrating unity apps with servers (linux, php, mysql).
So it would be fast to make your server tasks or even server modifications.
For GUI windows I am using NGUI plugin, it will make better looking and good perfomance. :)
In short - just copy past code from my previous projects. :)
Of course, time depends on how much you will want to tweak game scoring functionality.