This project has some of the worlds and players I played within 1.0 (I think). I'm uploading them so that you can try them out, and you can see what a 1.0 world would look like. I'm warning you, wired stuff may happen with the files, some of this stuff may not work. (I think it is 1.0, if you already have a version of 1.0, then it may not work). I'm still 90% that it will work though.
*One of the players has a full set meteorite, some hell-stone tools, a dirt rod, and rocket boots with a balloon to fly with. In the player's piggy bank is 57 gold, and building blocks in it as well. *The second one has a set of molten armor and a Muramasa. *Note: Some of this stuff may not work, you may also find a .plr file called player1, it doesn't work.
*One of the worlds which is the homeworld, has a few buildings that have some junk in them, (a keep with a room for you, a home base, an NPC home, a blue structure), and an unlocked dungeon. On one side of it (to the right), the world is cut in half, and a structure that just has a platform in it, if you fall down this platform you will land in water, and also end up in hell. *The second world just has an EoW arena in it, and the dungeon chests are unlocked. *Note: Some of this stuff may not work.
I also kinda left some doors open...
Tell me what you think about it.
(Also scroll down to the comments for a link to what I think is 1.0 to use so that the files don't do weird stuff in 1.4)
I hope this description works for you...
It may also be outdated! (this description)
Update:
Just a quick note. try loading the world in Tedit for 1.3 (downloads: https://www.binaryconstruct.com/downloads), which should load the state of the world to a newer format. The reason why I say this is that the last time I loaded a world form 1.0 it was in 1.3, and I recently tried loading it in 1.4 but the files I wanted to use corrupted. Or try loading it in tModLoader, as its current state is 1.3 (at the time of me writing this).
added 1 new world.
I will be putting this update in the changelog.