Fascinating stuff. Meena Kandasamy incorporates something like this in her novel, Exquisite Cadavers, where the body of the text is the fiction, and marginalia describes the real-life inspirations for each section. Henri Michaux did something similar in Miserable Miracle to describe both the physical and the phantastical effects of mescaline. I love this parallelism either because of the old Rupert Bear annuals I read as a child, or it may be that I enjoyed the annuals because that method was already attractive for some reason. The Rupert Bear books had pictures, a straightforward body text, and also a rhyming couplet for each picture. I loved it.