Good luck with the search, but I don't think you will find anybody that used a cab from a mini truck. Just frames and parts.
I think it will be fine. Make sketches and/or models.
I want to do something similar as well. Using either a dakota or s10 cab and bed, with a 130" wheelbase, so it will be oversized.
Personally I think you will need to remove the existing windshield and make a windshield similar to the older ones. I think a convertible would look best. Remove the frame around the window on the doors. The frame is another issue, the front IFS does not look very good if exposed. But I am going to try a full size frame from a C1500 or Silverado. The front arms on my silverado 4wd do not look half bad, they are not stamped metal, I assume they are forged steel. I think if the front and rear suspension were grafted onto a fabricated 2x4 frame it would do the job well.
what frame are you going to use?
truck roadster idea with twist in ohio