Project Quilt {french general} - part 2

Ok a week off from work is great to get ahead with projects. I did not expect to go this far with my quilt project. But I have finished the 36 blocks planed to do this enormous project. 

 So I was very happy to set all the block down and see how it would look like.

The problem was to put these things together.... Well some are smaller than others....

I have managed to sew the 2 first row before the end of my vacation, but it seems that there are some spots where fabric bubble a bit. I can't wait to move ahead and see if everything will fit. I hope after all this work.

Any hit on how to gather pieces that do not have the same exact size ?