Great questions. The original countertops including sinks and fixtures were about 80 lbs total. The Corian and associated fixture upgrades is about double that. According to me, who lifted them all but didn't weigh them formally.
The Corian was 1/4 inch thick with one inch thick edges. The remainder was 1/2 inch plywood with various glued on pieces for strength where screws were used. Total thickness one inch overall, vs the laminate which was 3/4 inch overall. This is 1/4 inch thicker than the original, and required some adjustments in backsplash height, stove mounting, and table hardware placement, and now I feel shorter at the table, but closer to the food!
For anyone interested, as in the pictures above, we did change the fabric of the couches to ultra leather or "pleather" as the wife calls it. Its very comfortable. You might ask why did we not get all these options when we bought it? Cause we liked the layout of the Safari FB and the silver inside walls. Plus we would have found it difficult to afford at the time. Every time I whine at the wife about why I don't have a Corvette, she responds by tapping the trailer floor with her foot....