Do you own a hole saw? There's a hole lotta innerstructure to hack away at on this design but it'll be a mess if you crash. The wiring harness probably weighs 100lbs. Pull the heater and ac out. Cut the bed floor out and leave the braces. Remove the tailgate and rear bumper. Lexan the windows. Rip the dash out. Put one racing bucket seat in and ditch that comfy bench. .... .... I bet you want to keep the radio though.
That S-10 idea sounds easier.