Hm! 
I have to say, that the blocks, outside of the 32x32 Grid are buggy. They appear, but they doesn't solid. I changed the coordinates of a single block in the data of the block, but only the textures with the right height of a cell appears, but not the ground itself as solid.
The 32x32 grid at the begin of the lnd-file shows, where, only inside of the 32x32 grid the solid ground for the block is stored...
Perhaps it's with changing the assembler code in the exe-file possible, to read the solid coordinate of a block from the block data too, instead of the grid???
edit: later I make a picture of this.
I have to say, that the blocks, outside of the 32x32 Grid are buggy. They appear, but they doesn't solid. I changed the coordinates of a single block in the data of the block, but only the textures with the right height of a cell appears, but not the ground itself as solid.
The 32x32 grid at the begin of the lnd-file shows, where, only inside of the 32x32 grid the solid ground for the block is stored...
Perhaps it's with changing the assembler code in the exe-file possible, to read the solid coordinate of a block from the block data too, instead of the grid???
edit: later I make a picture of this.