hagen, i cookie-cut one of the other proposals, you'll see it here: https://libre-riscv.org/nlnet_2019_wishbone_streaming/
if you want to use that to start from i left some TODO sections, do keep it short, it really does not need much. they can always contact you and ask follow-up questions.
if you prefer to write one yourself do feel free as well. you will see the list of questions that are asked, copied to that template.
l.