This is a great article which is gotten me thinking that RA-4 at home may not be so daunting after all. A couple of questions. When you say

-Chemistry-Kodak Stuff-

What, specifically, do you mean? There's a confusingly large select of RA-4 chemicals at B&H, many of which can't be shipped.

I understand that I may need to make test strips, but can you give a ballpark amount of time that paper exposure takes -- 6 seconds, 6 minutes?

Finally, when you say "wash until the paper has no fix left in it", how do you know?