Hi.
The recone can be only as good as the reconer

.
Reconing an undistorted, non-chipped, clean gap speaker is a breeze. Measuring and otherwise making sure the basket is still reconeable is PITA, and even if everything measures/looks good, an unpleasant surprise may lurk behind the corner.
Cast baskets generally hold their shape better than the stamped steel baskets, so that's a relief for You.
Good luck, You'll going to need it.
Regards
Sam