TwSurfaceReference, externs and structs

Hi there, I am trying to make Ken C. Finney's cool twSurfaceReference object a serverside "marker" type objects and hit a wall with externs and structs...
beffy.de/phpwiki-1.3.7/index.php/ScratchBook
I have this

extern struct TerrainSurfaceStruct BaseTerrainSurfaces[];

and I want it to be a member variable of SurfaceMarker...
I've posted the code on that wiki page, basically I was just trying to get the definition of that struct into the "public" section of the header, but it gives me syntax errors if I do so...
(Syntax error: '{' ...)

public:
struct TerrainSurfaceStruct BaseTerrainSurfaces[] = {   { false, NULL},{ false, NULL},{ false, NULL},{ false, NULL},
{ false, NULL},{ false, NULL},{ false, NULL},{ false, NULL},
{ false, NULL},{ false, NULL},{ false, NULL},{ false, NULL},
{ false, NULL},{ false, NULL},{ false, NULL},{ false, NULL} } ;

any ideas how I get this extern struct to a member var, pointer, whatever? :/