Pretty much have to have one just to marvel at it.  Need to do a price check first.
Built as 1/72:    243ft fuselage    345ft wing    70ft 1.5in height
Then to find however many 1/72 engines to fly it.
Runway, taxiway, parking apron, and hanger size would be civil engineering challenges ! 
How many hours would it take to fill the tanks ?