One small issue is the stack inserters look very similar to the regular inserters. I checked the box to flip them horizontal without any effect.
Do you mean that it didn't flip them, or that even when flipped it wasn't clear which was a stack inserter?
One other small issue is the recoloring of circuits. Brown and Green circuits are both red with the artisanal reskin, making them hard to distinguish on belts and other places. The green - red - blue progression is very familiar. Bobs adds brown and black. Would it be possible to keep the standard progression and reskin the brown and black? If not, reskinning brown and green to red and something other than red would be most helpful.
My understanding is Seablock includes Circuit Processing, which further complicates the circuit situation. As it happens I am improving compatibility with circuit processing, and also the standard progression of green -> blue -> red is being added as an option as well. I intend to have it all working properly by December when I next release.
It also resolves an issue where the Circuit Processing circuits are reskinned and not Bob's circuits (in part because of the way that Circuit Processing takes the internal items back and makes entire new ones for Bob).
I am thinking that I will have the color progression for Circuit Processing match that of circuits, so that the components for each are similarly colored.