Hi,
I discovered this after fitting the body, What a pain.
Actualy it isnt that bad. Here's a solution if you've already pinned front and back of the body tub.
Give the sill a good yank in fornt of the rear wheel arch and you'll find it can be pulled out quite a long way without any harm - its very flxible. I beleive the same principle is applied when fitting cabs to HGVs. Prop sill wide of the body with a bit of 4x2. Mark up the line you want to remove with a magi-marker or similar. Get out the angle grinder, gloves mask and gogs and an old cutting disk. Run the angle grinder long the edge. Rub over edge with some course sandpaper. Remove prop. Job done.
Thats what I did anyway. It was pretty easy, I was just worried about taking too much off, so had to have several goes,...and then took too much off anyway, so had to bolt on a little plate onto the chassis at the rear. The assymetric nature of the body tub meant that I had a lot more pulling out of the sill to do on one side compared to the other to make the doors nice'n'flush, hence the extra corrective surgery. But you have this litte pleasure to come yet
.
Kevin