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Hi guys, Hoping to finish the prototype phase here, and experimenting with layout. I've attached two versions for comparison. All opinions welcome. Ver A would have shorter cabling on inputs and outputs and would generally dress better in my opinion, but Ver B makes for the shortest possible I2S lines, at the expense of the other runs. I'd prefer A if its still short enough I2S, but I will honor fidelity before form if anyone thinks its going to be an issue. note: the usb module is left out as I'm waiting for a good option (no pressure TPA!) but there will be plenty of room in either layout I think. a couple other questions: a. is the partition between Transformer and DAC ridiculous overkill? easy enough to do if it will make any diff in sheilding b. I have the main compartment electronics on a 12"x10" subchassis to physically isolate the audio electronics from everything else. Again, is this a ridiculous notion? If you can't tell, I'm pretty green. Any feedback would be appreciated. Cheers. Version A  Version B 
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In this case I would do version B, but with some changes:
1. Use a board to board connector on the Sidecar to plug it right between the input module and DAC. This saves you some length overall.
2. Mount the inputs more or less between the outputs. You have height, so use it. You can put the outputs above the inputs or below, depending on your preference. Or you could mount the AES between the outputs, and the coax/toslink above/below them. You could plan the USB input in the big space you have left on the left of the input module. Plenty of space, and this should make it align pretty well with the I2S input on the Sidecar.
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You could move the DAC/IVY/INPUT stack from Option B more toward the middle of the chassis, put one of the power supplies on the opposite side (front). That would give you more lateral space for rear-panel utilization.
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Much obliged to you both, excellent ideas. I think I'm going to go with Ver. B, stack the inputs and outputs, and use the board to board connector. I'll post in the gallery when I have something worth looking at.
Thanks!
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For what its worth, here's a 3rd revision based on the feedback from the experts here. I added a drawing of the rear panel to show the layout of ins and outs. I threw in the old version of the USB and it fits quite nicely. Thanks to Brian and Leon, I think this layout makes for much shorter cabling on nearly everything, and still leaves plenty of room in the box and on the panel for any expansion down the road. Thanks again guys. 
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that´s basically what I use, except that s/pdif input module is mounted vertically on rear plate on 25mm rods
best
Leif
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