Goodly

What does this have to do with MCGalaxy saving in those formats though? Were you hoping to use MCGalaxy level outputs as reference?

What is the purpose of doing this?

No (it does not)

What's NMS?

Many basic building commands are explained here https://github.com/ClassiCube/MCGalaxy/wiki/Drawing

You weren't banned for speaking spanish. You were banned because your post was only one word. No te banearon por hablar español. Te banearon porque tu publicación tenía solo una palabra.

You will need to use commands to add the block to the server after you have the textures you want to use. https://www.classicube.net/forum/viewpost/6048-custom_block_creation_a_user39s_field_guide/

You should post any crash logs or crash message if there is any.

To add to this, make sure you resize by doubling only, such as 200% or 400% size

Try visiting this url after you log in: https://www.classicube.net/acc

They have either used /nickname or the server accepts any username and not just ClassiCube accounts

Can you please join AlwaysClassic so we can investigate this further? Solved, there were two issues: 1) AlwaysClassic is configured to use skins based on the Minecraft account that matches the ClassiCube account name. So if you don't own the same name on MC and CC it won't work like expected. 2) -own isn't valid syntax for resetting your skin to default

You can summon it using /hax summonentity tnt[tags:nuke]

I was just echoing what Unk told me when I asked him how I could do it ages ago. Source code would be appreciated

There is no way to change what level players spawn into initially