If you look on Vapin art, they list the spider Web as a cover so sounds promising there will be some cool designs and we can switch them out, that's pretty cool!
Knowing Yihi, the top cap/510 will be stainless aswell as the spiderweb or cover, ill be very happily surprised if the rest of the mod isn't all zinc alloy, either way, ss or zinc alloy it's going to be a heavy lump, I wish the main body/shell would be aluminium like on the dicodes with the rest in stainless steel. That 550 board though, oooooh it looks epic!
Have you seen the vid of it in action?