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Thanks men glad you like it. Dave on the air tanks were they a set for the trailer and another for the tractor. How do you get the curve in the styrene for the fuel tanks thought you might have a technique.
1. Yes there were a set for both.
2. I glued a thicker piece of plastic stock on the face side of the tank so that I could sand it to the shape desired. You will only have to break the edges to round it a very little.
3. On the air tanks I filled them on the back side with plastic scrap that fit the hole left in the casting and fill and sanded it to shape. Using the plastic scrap is so that I do not have to use as much filler.