This gingerbread version of Farnsworth House — Mies van der Rohe’s modern masterpiece in Plano, Ill. — is a (deep-pocketed) design lover’s dream. It took the elves at April Reed Cake Design several days of photo research and about 25 hours to construct the fondant-covered walls, poured-sugar ‘‘glass’’ windows and sugar-paste I-beams and staircases.
