Just a couple of things,
Also wouldn't boil the grains. I would also use 60-70 degree water.
What yeast does that tin come with? I was under the impression that it's a true lager yeast?????
If so, i wouldn't be fermenting it at 24 that's for sure. Half of that and your closer to correct temp. Most people will ferment lagers at anything from 10 to 14 degrees. Low and slow.....
Having said that, if it's not a lager yeast supplied, then try 18 to 20 degrees. Either way, keep the temperature as constant as possible.
happy to be corrected on this but i would have thought that cascade would be out of place in a pilsner. The saaz is spot on, it's the classic choice for pilsner beers (czech pilsner in particular).
Cascade is right at home in a nice hoppy ale, but i don't think i would like it in a subtle pilsner type beer.
If you are not brewing to style then go for it. It will make beer, and probably quite nice beer, but if you are going to style i would try some of the tips that keiffer and i have recommended.
Cheers,
Nath