I notice that searching for many popular hacks from RHDN on RHP yields nothing. Sites like NeoRHDN, for instance, contain the entirety of the RHDN archive as well as new hacks, and treats both the same. It would be more convenient for users, and in the spirit of preventing a romhacking diaspora, it would probably be a good idea to have pages for all the pre-existing hacks as well. At the very least, the search bar on the site should index the archive.
I'm aware of the archive page, but that's quite different. It's a separate domain entirely, not to mention it's missing critically important metadata such as the hack description, rom hash, release date, and so on.
To make it clear that it's mirrored content, you can include a notice or have different styling on those pages. However, because NeoRHDN is a superset of RHDN, it's still my preference over RHP, even if it isn't as well styled.