Also,
The way I did my tracks was to clip them off the trees, sand and polish lightly with a Kiss 4 grit emery board (WalMart), then glue them up against a straight edge. I used Tamiya Extra Thin cement and let the lengths I made up for the bottom cure completely, then worked up lengths to go up to and around the drive and idler wheels. If you let them set up for about 15 minutes or so, you will still be able to "mold" them around the wheels without all the links falling apart. Then work on the top center portion again letting them set up for a while, but not completely cure. Then you can work a very realistic sag in the tracks and will be able to tweek the number of links to get the sag to just hit the two center road wheels.
The one place I had to be real cautious was in cutting the links off the sprews. More than one broke above one of the end attachment points. I think I wound up cutting the center point first then each of the end ones in turn. This seemed to put less stress on the end points.
Good luck and have fun.
Bill W.
Bill
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DML M4A2 Red Army
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-- There is a fine line between "hobby" and "mental illness". (Author unknown)