If you haven't shipped one, you probably don't know.
Stack shot.jpg
Use the technique shown above to weigh your monster on an ordinary bathroom scale.
Then take the hole shot.
Hole Shot.jpg
Damn, that's a dark hole.
However if you happen to have a surgeon's headlamp handy and a zoom lens,
Hole 2.jpg
Bingo
87 pounds or about 40 kilos for you metrics.
The question then that I'm sure can be answered is:
If someone buys your monster, apart from putting it in a cage, what is the best way to ship it?