Welcome to Salix!
I've moved your post here which may be a better place to introduce yourself.
We would be very interested to hear how you get on with that Mac laptop, if you do decide to go ahead. The EFI boot needs as much testing as possible in different situations.
Ratpoison is an excellent choice for a slow laptop, because it uses the screen space efficiently as well as being, well, fast. Do check out the Ratpoison chapter in the Salix Startup Guide if you haven't already (link on main page).
Salix xfce 14.1 has just been released, and the Ratpoison version shoudn't be too far behind (though as they say, it takes as long as it takes

) Meanwhile, the latest is 14.0.1, which doesn't support (U)EFI.
Please don't hesitate to ask for support on the forums. Ratpoison has a steepish learning curve just at first, but it's great fun.