To my knowledge there isn't an aLTTP map lying around for us to use. I have seen a map of a portion of alttp overworld but I forget who made it and I don't think they were releasing it but using it in their own quest. Remakes don't often get completed as making a quest is hard work and the desire to make something original quickly over powers the urge to recreate a classic. Sadly, the alttp tilesets that are available need a good deal of work. If you have the drive to recreate alttp then go for it but you might want to consider starting out in a complete tileset and making something in the spirit of the original instead of a full blown recreation.