That first "sentence" was hard to read (I'm not 17).
But the value of a running '82 LUV 4x4 diesel should be somewhere between $250 (low-end scrap value) and $13,000 (I saw an '81 4x4 go for this much a couple of years ago, but that it was like new). If you could post some photos, that would help to narrow it down. Based on description alone, I'd say $1,000-$2000. That's assuming it doesn't have rust. The condition of the electrical system could drag the value down, based on what you've told us. So he replaced the cab and bed, but not the chassis. Are you sure there is no chassis damage? Did you drive it? Value would also depend on the condition of the tires.
Jack
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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.comIsuzuPup.com