Sweet.
I hope for two things though.. One being that there are some other drops added, because the osrs items seem pretty underwhelming, maybe besides the boots, but since we can teleport all around the place and bank without losing much time - I don't think that the tank boots will be of much value here.
And if you're considering adding the cannon, I don't think it should be in-game, unless you've thought about it and how people could abuse it. Mainly that probably being because one world, catacombs, etc.

From what it drops on osrs, the boss seems like the lesser version of Sire/Kraken boss. I haven't killed those two things once and I don't really feel like I've missed out much of anything.