I built 8297, the Off-Roader. I made a lot of changes, mostly with the gears (wouldn't get them all meshing), didn't put it the differential because it's not in LDD, no pole reverser either. Some panels don't exist in LDD so I used similar ones. Suspension system is very different as pieces don't exist in LDD. Didn't put the hook and line in there because the string in LDD4 is flexible. Engine is completely different because 1) the crank shaft end pieces in LDD have different holes than in the real pieces, and 2) LDD didn't include the cylinder blocks (even though all other motor parts are in there).
I still think it's looks pretty cool.
Image (Oversized)
LXF File