Shrimp, corn, sausage chowder (dairy free)

This worked out amazingly well.  A bit of a shocker given how similar recipes I've made that have been good but not great.  As usual, I was making this up as I went along so the quantities are mere guidelines.

There was no dairy added.

1 qt Chicken Stock (I used the Costco carton, was a quart, hence this quantity)
5-9 Yukon Gold or Similar Gold potatoes
1 large onion
Olive Oil or some other Vegetable oil
Shrimp  (I used roughly a 1 pound of "old" frozen small shrimp)
Sausage (I used 4 links of a Smoked Beef Sausage Costco had for Passover)
1 or 2 cans of corn
(Optional) Flour and butter roux

1. Boil chicken stock in a "big pot"
2. Season the stock as desired with salt and cayenne.
3. Cube potatoes into small pieces (say 1/4 to 1/2")
4. Boil potatoes in stock until mostly done (say 20 min or 10 min in a pressure cooker)
5. Cut up onion into small pieces
6. Saute onion over med heat in 1-2 Tbsp of oil until almost soft
7. When potatoes are nearly done, add onions to stock + potatoes
8. Chop sausage into pieces and fry rendering most of its fat.  Remove fat, via paper towels.
9. Add sausage to the stock.
10. Open can(s) of corn and dump into the stock with none/some/all of the corn juice.
11. Meanwhile defrost the shrimp.  Drain.  Add to the stock.  This should occur near the end
12. (Optional) Melt butter and add flour and salt to make a roux.  Cook so the flour is not raw.  Add to the stock.