First glance looks pretty good - only thing that looks a little off is the error annunciator, is the font a little bigger on that? Is that copying the original, or a limitation of the manufacturing process or something? Note that I am NOT a "design professional", just somewhat fussy!
While I lucked out with a good VFD on the unit I bought, I think you'll be pretty popular offering a display replacement that costs less than a whole extra meter!
Edit: Should have looked a bit closer, Josh is totally right about the kerning. Still overall looks pretty nice though.