Chris,
First of all, wow, that's a nice bowl. I can turn something large on my lathe, but I've never tried it. I'd have to rotate the head stock (easy to do). I have a stand from my old delta lathe too, but I'm just not there skill-wise.
I have a phone number from someone who has 8' wide slabs of mango. I can't even pick it up, let alone ship it back to Delaware. Interested? He's on the big island too. I'd be interested in splitting it with you, but I can't use too much of it (maybe 20 boardfeet). I have no idea what it looks like and I never met the guy, but the guy who sells wood items at the outdoors market in Kailua Kona told me about him and I got his number.
Aloha (and mahalo that's the extent of my knowledge of Hawai'ian),
Rob