What I find "advanced" if you will is not the stitching per se but the manipulation of all that fabric in its various forms and attachments. Trying to keep the body fabric out of the seam can be a nightmare if one is not careful and used to working with billows of soft slinky fabric. I agree, the techniques used to make the hammock, even the dual mode is pretty straight forward. But the more practice one has controling the fabric and machine the simpler that becomes. The basic Bridge hammock is simplicity itself to put together if you have the patience and the practice to do the job.
I hear ya bro. My DIY bridge was a "Real" project for me. I put many hours into it. In fact, it might be the coolest thing I ever built.