The problem having a 2006 Version of the forums and such is the fact that it uses Jagex's images which is more of a hint towards a DMCA Take down notice because they will think it's a phishing scam and other crap. The best bet is to make it look SIMILAR but not 100% identical. Meaning, don't use the same pictures, make your own and base them off the originals.
I know it's like WHO CARES THEY WOULD SHUT US DOWN FOR THE PRIVATE SERVER BEFORE ANYTHING, but you would be surprised what jagex would do. I mean crap I got my webhost shut down after 3 days of having the new website that was a replica of RuneScape's for 2010 I believe it was. 3 Days. All gone. So I can only imagine what they would try with Rune Rebels.