Given that this is a larger lab with a lot of dependencies, it deserves a solution file like in other labs to be able to speed up and compare code. Assume you had an error in one of the previous steps, the optional exercises are not reproducable.
Hello @fs7
Assignment labs usually do not include solution files since students need to be able to complete the labs using the instructions they are provided. However, if ever you get stuck in any part of the labs, you can use this forum to seek help.