Your cases hinge to the side like this one?-- To retrofit this to a top hinge would be pretty difficult. Seems like it might be easier (and cheaper!) to sell those cases and buy a set of top-loaders. The other option would be to post up a trade in the Flea Market--your Micatech's for somebody else's Zegas. It would be easy to put a front hinge on a Zega or a Pak-Meister. Also, there is an inmate in Portland, Stefan Dietz, who makes custom panniers. Since he's so close to you it might be worth the effort to see what he thinks about the project. Here's a link to his vendor thread. Anybody else know who makes a top-loader with a front hinge?