The Whirlwind was first discussed in White Dwarf #117 – from the Rogue Trader era – in an article by Rick Priestly with a following article by Tony Cottrell discussing how to convert a Rhino into a Whirlwind, since there was no official model at the time.
The conversion:
The studio staff painted two which were featured in that WD:
The back page of that issue shows one in action:
In 2nd. Ed. there was an official model:
More to come.