That site was an example of that type of PHPNUKE theme!
Not all phpnuke theme are those full page width fatsos!! lol

you can edit the width of any theme yourself.

exp. www.ghettoassualtteam.com
The theme is zoneCopper which I edited to 90% of browser instead of the defualt 100% Some themes do reallyw ell, others not so well. If you need help, post back.

depeneding on the theme - the files needed to be edited are theme.php and header.html. BOth found in your theme<them name directory

i have a gaming themes that might be some help, they are my old themes i created for nuke 6.5x i just never released
i dont have them online but if you email i could send you some.

email:
imaginationengine@hotmail.com
or
admin@perfectgamestudios.com

thanks

stephen bishop