Disappearing 4 Patch Quilt

I decided on making a Disappearing 4 Patch Quilt.  I like the look of the whole quilt.
I have started with a 7 inch square for the 4 patch block.

I have made about 22 4 patch blocks so far.....What do you do?  Cut everything, then sew...or a bit of this and a bit of that??  I get bored so I do what I feel like!! haha

Here's some of the 4 patch blocks I did so far....

I decided to cut and sew a block so Frank could see what I am doing...I think he was impressed....

I am trying to figure out how many completed blocks I will need to make for a quilt for my queen size bed...I am thinking at least 56.  I want the finished quilt to be about 100 inches long and 86 inches wide.  The finished block is 12 inches. If I do 8 blocks down and 7 blocks across, it will measure 96 x 84 before sewing the blocks together.  Then perhaps I will add a 6 inch wide border. Any suggestions??