In my opinion, your materials and construction method is not appropriate for the project. If the total length of the walls will be less than 20 feet, I suggest you look at doing poured concrete. A 6 inch thick poured wall will be much stronger, cheaper, and since the surface would be a smooth curve, the stone veneer will be much easier.

I haven't used this product but I'm filing the info away for future! Its nice to see someone post something they've learned (the hard way :D )

lalitha, If you are just basing your decision on "safe" where you will not be poisoned by it, then it is safe enough. This is a decision that you have to make for yourself. the industry says that the sealant chemical that they use is nontoxic and food safe. I decided that I did NOT want to use a surface that requires sealing in my house. I wanted to be able to roll out pizza dough on the surface without the worries of chemicals. I used quartz for myself for this reason. There is no right or wrong decision. You need to be comfortable with your own decision. You could say that millions of people use it without any problems so it must be safe. You could also say that the effects of chemicals is accumulative and delayed. So why use something that you don't absolutely need. Either way, it comes down to a personal decision. Each person has a different parameter of what they accept in their house/life: organic versus non-organic, low VOC paint versus normal paint, treated wood versus non-treated wood, eco friendly countertop versus petrol based countertop, electric car versus large SUV. The list goes on and on. Good luck on your decision.

Thanks for the info - I figured Corian wouldn't be budget friendly. I'm willing to spend as much as it would cost to tile or slightly more - pricing is a bit hard to find on many sites. Unfortunately the 54" width is the largest I can do width wise without completely changing the footprint of the bathroom which comes with its own expenditures. I could build out to make it smaller, 48", but it would be a shame to go smaller and I think would look rather odd. Thanks again!