Installing EzPortal is no problem what so ever, I may do it free, I can set Up a front page like this here! However the example you are referring, will need A complete web site design, and those site all have their own php code.
The joomla system you are using looks great, will very hard to duplicate on SMF, not mention the author's copyright.
I to be real honest I feel that your SEO will be better if, you let the links from the front page to the forums and back.
the other site you used for example is yet other system xenforo.
also not certain but joomla should have some way to check the page views.
Just some things to keep in mind.
Please let know your thoughts!
A complete theme is also a possibility!
But nothing will easily do like you have shown here!