use tenax 7r. Not a glue but a welder, it will melt and weld the plastic leaving it manuable until fully dry so you can form then on the sprocket and idler and around the wheel's
I suggest you attack them a bit at a time, building around the sprocket, and then construct the track going on hte wheel, then on hte idler and back to hte sprocket, kinda like a looop, once finsihed you can paint the looped tracks seperatly and attach without any problems after.
Don't judge the tiger lol, its under some pre-shading and it waiting for the proper colors to be bought... in build projects are never nice for me lol
Frank