I personally would up the CaraPils to .5 and would probably throw in some crystal 20 or 40 and maybe some Munich for a little bit of flavor.
I would assume 70% efficiency for your first go-round.
60 min mash is plenty long enough.
Definitely take a pre-boil gravity reading and remember to adjust for temp in beersmith. I use DME to adjust from there.
I personally don't like cascades, but if you do, this should be tasty.
I would consider doing some water chemistry to make sure you get a nice clean hop profile depending on your water source.
Hope that helps.