I've not worked redwood but my understanding is it's not a real hard wood. Looks like it's got a fairly low Janka hardness number (480 on old growth) which might make it problematic on a high wear item like a kitchen table. Not a deal breaker but depending on how you wanted to look as a finished product it may not give what you want. If you're ok with a more worn well used appearance then no issue at all.
Do you have the tools to tackle the project and the understanding of joinery? I've seen some projects use up good wood and come out real poorly because of bad joinery.
I'm firmly of the belief if you can tackle it that there's little better than producing your own furniture. You get the design you want with the materials you want and the pride of doing it yourself. As long as you know what you're getting into I'd say do it. Unfortunately no milk to offer you though. Sorry, keep us posted on your progress.