Looks like you have identical guage location setup to what I had when I first got my Destroyer...... since then, I've managed to flush mount a garmin gpsmap 182, garmin 160 blue fishfinder, and the icom 503 vhf inc icom ds100 dsc controller. It took a bit of fiddling about with bits of paper cut to the same size as the components to be installed, but it all got in in the end!!
The problem I had was getting the battery out from the front of the console - that took about 35mins to do by means of 6 screwdrivers, and lots of gaffa tape (to stop the thing from dropping on my foot)
Flushmounting everything sounded a good idea at the time, and it does look good, but the whole job with my console took about 4 complete days to get sorted and wired..... there really is not much room in there!! Once the battery goes back in, and gets fastened down, it's pretty well impossible to get your arm back in.... all this is assuming the battery is on the higher level in the same compartment as the steering wheel unit. If you'd like me to send you some pictures of the console in bits, let me know.
Damn.... 55mph..... that's over 10mph faster than my 6m with 140 bolted to the back
One solid boat you have there.... have fun....