Selling the GS500 resulted in some vacant garage floorspace and some cash burning a hole in my pocket. In a moment of weakness I bid for a pile of crap otherwise known as eBay item 220766700748 which may or may not have enough good bits to make a working Superdream 400. I did not expect to win but now it is mine. I foresee much tinkering and fettling to occupy my retirement for the next few months. Or possibly a visit to the tip. Time will tell.