well i built so many trex that i could do it with my eyes closed. i can get the ball park link lengths pretty much by looking at it.

the

1) servos centered and subtrimmed level for good geometry, left stick centered on default curves
2) level the swash and it sets the correct height, adjust links to this tool
3) washout should be level/flatline therefore adjust the 2 flybar cage links
4) macro links should have a about 3-4 twists away from touching
5) adjust micro links to the pitch gauge=0deg
6) setup max/min collective pitch using default curves, adjust pitch ECCPM%
7) setup cyclic pitch of approx 6deg, adjust ail/ele ecppm% (phase blades at 12/6 and 3/9oclock)

the heli will track perfectly and have minimal eccpm interaction at this point, i don't even have to fly it to know it'll come out good.

as for the dampers, i replaced mine with fuel tubing before i ever spun it up. they dont last long especially if youre flying hard. hard 3d will probably kill it in ONE flight.

if i have to mass produce RTF Trex for the store, this is how i do it. I do it on a consistent basis, and it always comes out perfect.