"I've checked out those projects. They are poor imitations."
The two projects have come at things from different directions; ROX has made lots of use of existing software and looks good with a lot of polish and applications, ROLF is trying to build up from a fairly minimal set of facilities (frame buffer, freetype2 and a fairly basic Linux kernel) to a system not unlike a RISC OS machine with just the ROMs, in the hope of adding applications later.
I've tried to make the system work as much like RISC OS' WIMP as possible (to allow for porting or running under emulation of proper RISC OS software), while allowing native programs to use extra features provided by Linux (such as pre-emption, asynchronous I/O, etc.). At the moment, it's a bit rubbish because it doesn't do much, but at least it does something, and it's the closest you'll get to "the actual RISC OS GUI integrated onto a Linux-like system", other than the emulation solutions currently available.