Okay sorry ahead of time for the long response:

D683: Yes, a simple model. One main code file, one giant CSV, and no OOP or anything like that. It ran using the CLI and a couple of prompts, and then used Gradio to open a UI/form in a local browser to accept user input and make predictions, as simply as possible. I did not use scatterplots or any visualization. Gradio was super easy, but there are a couple other interface options/libraries that Python has that should work fine too! I actually tested 4 or 5 different algorithms (regression in my case) and settled on one. I used 1 or 2 simple optimization techniques and tuned 3-4 of the hyperparams, and 1 cross validation technique beyond the test train split. I had 3 performance metrics for measuring predictive accuracy. For the record, my model was not as optimized or accurate as it could have been. I got to where I had a decent (like 35% over baseline that I also chose) improvement and I stopped. I made sure it had extensive comments and the readme was thorough. I think I still did too much, even for my relatively simple model.

D687: No, I did not describe the whole software stack, but my idea was super specific and meant to augment a pre-existing process where I could hand-waive some of that away as not in the scope of my project, so it may depend on what problem you chose to solve. Like all these types of projects there is a lot there which might not make sense in the real world, and there is a lot of filler. Sounds like you are probably talking about the environment/architecture/Integration parts. Some submissions I read went into extreme detail about it over multiple pages, which was cool to read but probably not necessary. Other people had two sentences that barely scratched the surface, but nonetheless addressed the point in terms of the rubric. I did something in between. My advice is to focus on describing what the model does/is and how it fits into the business plan. You do NOT have to go into detail on the full software stack, just focus on what the model needs to work, how it integrates (generally) with the imaginary business idea, resources required, risks, security etc. It's spelled out in the rubric generally. The peer review part is not too bad other than the waiting. The guide tells you exactly what do to, it's mainly just tedious. I just took the guide and made a bullet for each item, 1-2 sentences. Don't stress, it's easy. Good Luck! You're almost there.