Could you build a 500 by 500 floati...

Could you build a 500 by 500 floating sky island with grass, dirt, and stone. So basically make what is on already on the ground in the sky reference sky islands from other people. anything that looks like 1.21.1 minecraft blocks that would usally be on the ground put them in the sky. Make sure the top of the sky island is relatively flat like a 3:1 block ratio between y levels. So to sum it up make it a 500 x by 500 z floating island to give a reference make to where someone just ripped a 500 x 500 plot of land out of the ground.