Hi Ian. That is exactly what it is. It didn’t come with that armour, it was a separate purchase about 4 or 5 years ago. I haven’t seen another one since. They make a lot of sense for protecting a vulnerable area and the construction of mine has some interesting points such being able to store things inside. I will take some pics for you tomorrow.
I don’t know why they are not seen much, I suppose they were and are overlooked as being not important. I bought mine on ebay from a Japanese seller.
Thanks for the compliment
Mark