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Without having gone and actually had a look at the island, I'm dubious that all of those things are possible. Mostly cactus, pumpkins, melons and reed. Unless they're provided, how can they possibly be obtained?
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Those things are provided. But you really need to be careful with your blocks - they easily fall into a great blue void beneath the island.
One tricky bit was starting a portal without the use of flint and steel. Or at least, the solution was a bit more finicky.