0x00 dword blockid      //00 08 CC CC
0x04 dword loadedsize   // * 4 in bytes
0x08 dword unknown1     //mesh id maybe?
0x0C dword unknown2
0x10 dword unknown3
0x14 dword unknown4
0x18 dword unknown5     //70 00 00 00 it seems always

now, if unknown2 and unknown3 are zero, thats all, otherwise next:

0x1C dword unknown6     //maybe model type from xentax post?, dunno
0x20 dword unknown7
0x24 dword vertexcount  //important!

struct{                 //elementsize = 6 bytes
 short x;
 short z;
 short y;
} buffer1[vertexcount];

struct{                 //elementsize = 4 bytes
 byte unk1;
 byte unk2;
 byte unk3;
 byte unk4;             //maybe connection byte?
} buffer2[vertexcount]; //tristrips maybe?

struct{                 //elementsize = 4 bytes
 byte unk1;
 byte unk2;
 byte unk3;
 byte unk4;
} buffer3[vertexcount]; //no idea

struct{                 //elementsize = 8 bytes
 dword unk1;            //U float?
 dword unk2;            //V float?
} buffer4[vertexcount]; //UV buffer?