BUT! I was so darn excited about how fast this little journal came together that I just had to share.
Canvas + Heavyweight cardboard/tagboard + Heatnbond Ultrahold iron-on adhesive + Gaffers tape (7gypsies in this case) = A quicker than quick journal! I just ironed on the adhesive to a piece of canvas, placed down the tagboard, folded over the canvas so the tagboard was enclosed, and ironed away. I cut off the extra canvas and put the gaffers tape over the raw edges.
Now I just need to sew in the three signatures, and I'll be done!