The lines are made with various corners & turns to keep all seatbelts in the stock positions. Here is the section of rear cab wall that is removed & butt-welded back together. To get the floor cutting started, a cut off wheel is used to give the recipro a starting slot. 
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 Next you can see how we remove a bigger section off floor so we can angle it to make it appear more stock. In this photo, you can see the section of rear cab wall we removed.
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