Nice conversion!! Did you use self taping screws?
What track radii do you use? The shelf couplers are about ready and they're draft box is like the prototype so I will have to have longer radii though I coupled a 60ft Atlas tanker & a Atlas 4750 together on a 45" curve and they performed fine & even coupled on the curve. The longest car I have is a 72ft centerbeam but this will be the exception not the normal car length.