I'm not sure if this thing was ever finished, and if so, whether it saw any action, but apparently a Libyan faction in the country's civil war started to convert a BTR-60 8x8 APC into an armored gunboat.
https://www.popularmechanics.com/mil...med-into-boat/
I did not include include this in
Baltic Boats https://preview.drivethrurpg.com/en/...6/baltic-boats
Here's a CGI artist's rendering of what the finished product might have looked like: