I have started a similar quilt kit. I did the cutting and fusing. I am now at the stitching point. Also started stitching before layering, but not sure I should have. What will be left to quilt then?
I have left this sit for a year trying to decide how to proceed. I also used heavy duty wonder under, so now it has to be a wall hanging, to stiff for a bed.
Live and learn.
I recommend doing one block with some of your own fabric to get the process down before using the kit fabric.