Replying to Home Made Snow Pants

So I decided after having the crotch in my Saga Pants, which I bought at the beginning of this past very short season, blow out and rip from knee cap to knee cap, I am going to make my own snow pants. And I am going to do this because no one makes HIGH QUALITY big baggy ski pants anymore. I decided to make my ski pants out of Black Denim, which I will be waterproofing with Otter Wax, and water proof canvas. I plan on making the Denim on the outside and waterproof canvas on the inside. Before I beginning sewing, I'm curious if anyone has already made their own homemade snow pants before? If so do you have any suggestions for the process of making them?

I have already bought all of the fabric and otter wax, so please don't suggest other material.

Also if you think this is a bad idea and I should suck it up and buy more Saga, I'm sorry, but I am mentally determined and financially committed to making my own snow pants.