Imperium,
The Casimir effect as source of exotic matter to hold open a wormhole was considered seriously a long time ago. Take a look at M. Morris, K. Thorne, and U. Yurtsever, "Wormholes, Time Machines, and the Weak Energy Condition", Phys. Rev. Lett., 61, 1446 (1988).
The arrangement they considered involved two huge concentric spherical shells of metal. The radius of these spheres was 93 million miles, yet their separation still had to be tiny ~ 10^(-10) cm. Not conducive to easy set up in your garage.