Looking like a couple of stingrays, these engine section halves are built and ready for detailing.
It's interesting to note that when working out the patterns for these, Charles found that the back of this model is entirely asymmetrical. It was not a matter of making one half of the engine structures, duplicating it and flipping it upside down. We found that the bottom hull curves up to its aft point, altering the angles significantly from the top. Because my model is more symmetrical than the original, we decided that I would use one half of the patterns twice.
Because the bottom hull is permanently attached to the frame, I was able to glue the supports for the engine structures to it. You can see just how deep and angled the engines are on a ANH star destroyer, unlike the ESB version, which is not as deep. Because of this, the ESB angles are completely different.
Another big difference between the two versions is the side trench depth. Once again, the ANH version is much deeper than the ESB. Also, this version has a forced perspective built into the trenches. Where the ESB is pretty much even all the way down, this one starts out wide at the nose and tapers down to a mere 3/8" at the rear. Even though the trench wall inside is the same height throughout. This is done by making the frame angle narrower than the hull so that the aft hull corners are out further than they are at the nose. But only just a little. Like I've said before, when dealing with all these angles, the slightest adjustment has huge, cascading effects.
When asking Lorne Peterson about the U-channels and rims, he said that they are made of brass on the filming model. You can see that I have brass channels (thanks to Lee), but I chose to go with plastic for the rims. I know that is anathema to some, but I did so after careful consideration. First, I know from experience that CA and brass don't mix. I don't mean that I would have tried to glue the brass rims to the U-channels, I would have silver soldered them. After having done a multitude of Star Trek TOS brass communicator lids, that would not have been a big deal. Its all the tiny details that go on the rims. I wanted them to be more secure. Super glued parts simply flake off the brass with the slightest pressure. I've devised a way of securing the plastic rims without gluing them to brass. It works really well as I've banged them into the wall a few times without damage carrying the model upstairs (big model + narrow stairs = :cry). So I chose to go with this combination for detail security. When painted it won't look any different anyway.
Lorne also suggested that I get a notching tool (a nibbler) to cut the notches out of the rims. If you don't have one, get one! What could have taken about an hour was done in less than 5 minutes.
It should be an interesting weekend. Patiently sitting in its box, the superstructure awaits being mated to the hull! Will this happen sooner than later? I don't know, but stay tuned!