Yeah, I've got all the connections in junction boxes, but not the transformer itself. I guess I'll have to redo that part
Before I installed it, I was a little concerned with the current through 12V wiring, but taking into account that in the office I'm only running about 2.5A through the wires (14ga stranded) if all lights are on, I'm not too worried.
The kitchen is going to be closer to 4A total - I expect to use the existing 14ga solid core wires and just transform directly before or after the light switch, so that shouldn't pose a problem either.