So, as @navetsea already asked, what's the problem if they shave the edges where they'll stitch the panels, if the rest of the jacket is still going to be heavy? Let them skive the edges. @Peacoat is right, though - It simply isn't possible to construct a leather jacket out of a 4 + oz leather, let alone 6oz. Even LW is exaggerating the thickness of their leather which is 3.5 oz at best - I don't mean that in a bad way, LW leather is still mega thick & one of the heaviest on the market but it's just clear that it's literally impossible to work with anything substantially thicker. But yeah, you just cannot fold such heavy leather in a way that'd allow you to stitch in, I dunno, pocket piping, zippers, etc. It's not possible. Best you can hope for is for the large panels to have the middle intact, with the edges skived to a workable thickness. My first Natal was made of a heaviest leather I've ever handled and even that jacket had to have been very soft and spongy for it to even exist.