Recently it was proven possible to construct an organism through synthetic processes. This is still limited to very close copies of the real things, but could be adapted to produce reverse chiral molecules.
Edit: Although, the added difficulty would be the need to reconstruct a cell completely out of mirror molecules for it to work. In the case above, the genome was injected into an existing cell and left to replicate. So it's not quite a trivial thing to do.
http://www.jcvi.org/cms/press/press-releases/full-text/artic...
Edit: Although, the added difficulty would be the need to reconstruct a cell completely out of mirror molecules for it to work. In the case above, the genome was injected into an existing cell and left to replicate. So it's not quite a trivial thing to do.