I was never really able to appreciate it, sadly - I guess I have to have a strong melody. But reading about the production techniques has been fascinating. Plus, I've not been able to make tape collages that really 'work' - mine always feel a bit contrived. So definitely kudos to anyone who is able to make it work, and doubly so if they're putting so much effort into doing it with limited resources.
Have you ever come across Michael Garrison, out of interest? His debut album "In the regions of Sunreturn" was recorded 8-track around 1978. Most of it is melodic but there are two or three tracks which are soundscapes, e.g. "Dreams" and "The Distance from here" (the latter of which seems not to be on the CD release)