MTS

The quilt pattern you linked to is made with quarter Log Cabin blocks.
(I'm unfamiliar with the bar graph method.)

Instead of starting the block in the middle and working the logs around the center, the starting square is in a corner, and the block is built up by adding to two sides, instead of four.

Four of the smaller blocks are joined to make one larger block (so you need 16 smaller blocks to make the quilt as presented).

You're asking for a bigger pattern -
Can't you just add more blocks to get the size you want?
Or do want to make the quilt larger by using bigger blocks?

The strips in that quilt are 2" FINISHED (2.5" CUT).
You can adjust it up or down to whatever size you want.
Or even add more rounds to each block.


And just an FYI - that particular pattern requires that every seam in each block match up when joined with the next block (the smaller 4 blocks to each other and then the 4 larger blocks to each other).

Most other Log Cabin patterns avoid having to do that (albeit with different color patterns).