Penpen, sorry it took me so long to get back to your question but my day job keeps me very busy.
To answer you my template has a 1 inch bar on the top center of it that should exactly 1 inch after printing. so check that to adjust your size a little better. also the template is made to be used for the sintra and then to be bondo-ed and sanded after the fact so there is a little le-way built in to it. that is just how i designed it originally.
Again sorry for the delay. I've been working 16 hour days my job as a veterinarian keeps me pretty busy.
Kakarrot