Yup, just turn your model 180° and you'll see that it is, in fact, a simple sink. The only addition is that you have to stretch the paper at the end of the sink (step 24). You can also compare step 22 with 27 to see the result of 23-26.
For anyone who wants help, I'm making an instructional video on this model which will be done by the end of today. If you have any specific requests, PM me or message me on youtube. It's the same username. Hope you like my new camera angle.
Yeehaw! Hot diggity demon, it's done! Part one and two of the instructional video are up and running on youtube! Hope you like it and to anyone who needs help, let's hope it solves your problem! You're welcome!