The 2030 is the most streamlined last Viberg uses. I would say it would be the closest thing to "formal" with respect to their lasts. Viberg currently uses stitch-down/nail-down construction, which I believe is the most sturdy and heavy means of making work boots. It's also way more time consuming than welting. Goodyear welts are the industry standard because manufacturers can produce a lighter product in greater numbers than they could if they made footwear like Viberg does. Viberg is definitely known for the way in which they stand behind their boots. As for whether anyone has had a Viberg boot resoled: of course many people have! Soles wear out and need to be replaced, regardless of who made the boot they're on. I just received a pair of custom boots from Viberg (via Four Horsemen) last week, and it took just over 5 months from the day I placed the order to the day they were on my feet. To get started, contact Viberg. I believe that this point you could ask to speak with Brett, Morgan, or Guy. Although I've never bought a shell cordovan boot from Viberg, I believe the difference between the shell and regular horsehide is that they're two different leathers that undergo two different tanning processes, from two different parts of the horse. Horse hide is just leather made from the hide of a horse, which shell cordovan is specifically from the hind quarters. It takes 6 months to tan shell, and because the hind quarters are just a small section of the animal, it's a rarer material. Check out the Horween website for their description of shell cordovan. I've seen a few folks online with leather soles. Check out the Viberg thread on the Iron Heart site (http://www.ironheart.co.uk/forum/index.php?topic=823.0). There are lots of interesting make ups, some of which feature leather soles.