My section width with the beadlock wheels is around 14.75". I have a little room from the sidewall to the notch. My notch isn't as deep as it could have been, it could be moved in about another 3/4"...
When we first mini-tubbed my car, we keep the factory outer section of the wheel tubs, we installed the typical cookie cutter wheel tub kit. This limited how far we could sit the car down with the 29.5" tall tire...
I decided to rip the tubs out and install a full tub that was taller and went all the over to the quarters. This gave me the height I needed to sit the car down...
You should be able to get the section width under your car with a deep notch on the frame rails and using the correct backspace wheel. With stock suspenion, you'll need an offset lower control arm. The stock outer portion of the factory tubs will limit how far you can get the tire up inside the car...
Let me know if you need some additional pics, I should be able to dig them up and I could send them to you...
John