I am still waiting for the second half of my pledge rewards to be sent. Monday, onthe Otherworld website, Richard wrote that the he was waiting on Griffin Moulds to finish up the remaining orders.
Changing your pledge isn't too hard, as long as you are raising your pledge as once you pledge the money is charged to your credit card or PayPal account. If you start low and want to raise, you add the difference to your original pledge. In the previous campaigns, I would also email Mike to let him know I was increasing to a higher level or adding add-ons.
Possibly not. The lava set looks to only contain 1 varient of the floor tile, which you wouldn't miss, particularly if the add mud pots similar to the original resin Cavern set - they could be painted similar to the fumeroles/vents. I chose the painted add-on because I know I wouldn't easily/quickly get the same coloration shown in the photos.