Ok, here's the answer you're looking for.

The S-10 Blazer has a 100" wheelbase on the 2 door, and a 108" wheelbase on the 4 door. It sits higher than the S-10
The S-10 pick up has three wheelbases. 108" shortbed, 117" longbed, and 122" extended cab.

The width (track) is 55" from hub/rim mating surface to hub/rim mating surface. The rearend of an S-10 4X4 is 59"

The S-10 frame is 34" wide at the front, expands to 40" just under the cowl. It's 3"X4" boxed all the way to the bed and wider and taller at key stress points.

If you decide to use an S-10 frame, get one that had a V6 in it. You can reuse the engine frame mounts. The 4 banger mounts are different and have to be removed, AND they are a BEECH to get out.

If you need photos or more information, go to my website.