Do you use that stupid cheat mod? The one that gives you all of the stuff you need?
Also, random obsidian on the bottom lol.
EDIT: what seed are you using?
No, I mined almost all of that. There are
very few situations where I used inventory editing, but that was for stuff like dynamite for purposes other than leveling the terrain (I did it all by hand) and places where I was like one block short from finishing a section. Other than that, all the wood was cut down, all the stone was smelted, all the bricks were gathered (took forever) and the city is basically 98% free from blocks acquired outside of legitimate methods.
Also, the seed is called "Dinozaur" without the quotations but with the capital letter. That's about 3km east of the spawn though. You spawn in a pretty bitching mountainous area.