BBC Model B with Raspberry Pi Internals

[Mark Wickens]

Bit of a tricky one to google this, so thought I'd consult the list - 
does anyone know of a documented project that replaced the internals of 
a BBC Model B with a Raspberry Pi (or MiniITX PC) interfacing with 
keyboard etc. to bring modern internals with a traditional interface?

I don't even know if there is a word for these kind of projects?
Thanks, Mark.