If you have a thick waist and fairly short front crotch length, when you are drawing off your SFD Pants Front Pattern, your numbers may fall off the Waist/Crotch Grid that is provided on the Pants Master pattern.
The remedy is so logical (as are most solutions with SFD). You simply extend the grid lines. I've posted a short, but informative article on drawing the solution on Adapting & Drawing the Waist/Crotch Grid. This article is found in the SFD Learning Center - Article Library. There's also a couple of photos of a what one person's body looks like with this situation and required this solution. You'll want to check out this article.
I hope you can see the photo of how easy this is to do.