taping/gluing paper mock up? ?

what have you found is the best way to put together the paper mock up? have you tried cardstock? does this make a difference??? or cereal boxes?/

Also as I move forward on other patterns, I take and use packing tape to tape over the entire pattern to a overhead transparency sheet (like for the overhead projectors in schools (once upon a time). This way I can keep the pattern and keep using it on leather... I do a lot with Veg-tan.

Any other idea's? Or any experiance with the plastic sheets that you can print on ink jet? I know that they exist but I havent tried them.