Brian, I read through that thread briefly and see that at one point, you were trying to make a 100% rye bread. I would suggest limiting the amount of rye for now to no more than 30% of the total flour. Supermarket rye's (Oroweat, etc) have about that much and the flavor of rye is very strong, so a little goes a long way. Rye has very little gluten, and is very sticky, which makes it hard to work with. Even the King Arthur recipe you cited may have too much rye if you are just starting out.
Also stay away from those recipes that uses bizarre ingredients like pickle juice - traditional rye has few ingredients. The only reason I can imagine folks use that is to add sourness - but you are making a sourdough bread so you don't need to add acid. Also, pickle juice, unless it's from fermented pickles, is the wrong type of acid.
Here's a formula I put together for you for a single loaf :
https://www.bakerscalc.com/HsiHmqUs
For the levain, the evening before you are going to bake, mix together 50 grams of flour and 50 grams water, and 1 tsp of starter. Keep at 75-80 degrees for 12 hours until it becomes very active. The flours you use in the levain can be anything, but it might be helpful if they somewhat mimic the flours you are using in the bread dough.
For a rustic loaf with a thick crispy crust, bake in a DO. For a softer crust, bake in a loaf pan or directly on a stone. I mix everything by hand, using only stretch and folds.
For mixing and shaping the dough, watch this video by Chad Robertson of Tartine. In that video he is making 3 different breads, but focus on the Country Loaf.
And don't give up if it doesn't turn out exactly as you want. Rye takes practice - a lot has to do with making sure your levain is fully active, and making sure the dough has proofed to the right amount and is strong.