Unless u can get a crane to hual it up through your window, I doubt u can even transport the 7ft tank up the stairs. Besides no one will want to bare the responsibility of damaging your tank during transport and a 7 footer is no easy task to carry around. Even if the tank maker were to make the tank in your house, he will have a hell of a time bringing the 7ft panels to your place even if it's on the 2nd floor.
U can imagine the stressed and shagged out faces of the people carrying my two 5 feet tanks up the stairs seven storeys up cos they can't fit them into my lift. Very paiseh after that and at the same time during the transport, my heart was palpitating like mad cos I'm extremely worried that the tanks may be damaged or that the men carrying the tank may injure themselves if they were to lose their grip...