Okay, it's a two-year-old topic, but over on the Airfix Tribute Forum someone posted in-progress pics of a gorgeous scratchbuilt 1/72 BL 6 inch gun Mk VII - there are two threads following it:
That's very good. Use of Ken Musgrave's plans does not mean enough to think that it was a Landshipper that built it , though; I've looked at some rc model forums that talked about model tanks, and they seem to have discovered Landships as a good source of info for WW1 tanks - on that score, I get the impression that WW1 tanks (mainly Mk IV and A7V, but also FT) take the fancy of rc tankers, a number of whom say they'd love to build one or wish that a mainstream company would produce them.