Yeah, you are wrong about the 105s. The 1HDT is very common in 105s down south, or as you say the 1HD-FTE. A soild axle swap will not make it any wider then it is now, that is if you used the right axle. I would think the ideal axle to use would be the front from the 105 series.
Any ways, cool truck and good swap. All the pictures though are not working, is that just me!?