Banksy offers sculpture for £2 -- with a catch

For just £2 you could own this remote-controlled boat sculpture that was once featured at Banksy's Dismaland. That is, if you guess its weight correctly. Banksy has donated the coin-op artwork to go into a raffle to benefit Choose Love, a store where you can buy gifts for refugees. An entry into the raffle is a £2 donation.
Here are the rules:
Your guess should be to the nearest gram (for example a guess of about 5 kilos could be 4800g). You can even specify milligrams if you're feeling confident. Closest guess wins the boat (the wooden plinth is not included in the weight guessing).
Competition closes 8pm GMT December 22nd 2018. At which time the boat will be weighed by specialist students from Kings College London. The winner will be notified by email. In the event of more than one correct guess the winner will be drawn by lot.
Guesses not limited per person. All money donated goes directly to supporting refugees and displaced people. The organisers reserve the right to small print etc.
Need a clue? The boat is constructed from a shop bought fibre glass hull customised with quick-cast resin figures which are foam filled and hand spray painted. Although the prize includes battery pack, that is not currently in the boat.
Boat dimensions: 90cm x 38cm x 42cm.
Enter here.
(Cool Hunting)