Hi
1) The website of the tournament is
www.shuffleuppoker.com
2) a rebuy will get you a full stack and the addon will give you a 2x or 3x stack (not sure).
3) I dont think you have to worry about tax as we dont pay tax on winnings here either (don't take my word for it though)
4)
Sun City (click for link) is the premier entertainment destination in South Africa and its an awesome resort.