ginge, point is the focus isnt a "ford focus" any more in DVLA licensing terms. It is no longer the same vehicle as it was. You could argue it is a replica of a focus in some ways but simply its a space framed custom kit car in any registration/legal sense.
In that sense the car should stand on its own merits rather than being viewed as a "modified ford focus".
If the rules state that an "OEM" spaceframed car wouldnt be allowed then so be it.