By 2004 he'd had offers, but from people who wanted the apartment dismantled and shipped to the US. The year he finished it he started rebuilding it to match the Voyager series designs.
He's just been building and rebuilding this thing for fifteen years, knocking back what few offers he's had because he either doesn't want to or can't afford to dismantle and ship it. I have to side with the ex-wife on this. Redecorating that flat may have helped him cope with his separation, but it's not selling as is and after fifteen years it's time to move on.