Any ideas for a good dashboard design...

[SkunkBoat]

You'd have been better off with one 12" vs two 7". You can split screen and do whatever but still get a big screen when you need it to see.
Reading a radar on a 7" screen is gonna be something...

Nobody has done two in that dash. Search Tags for "dash".
Looking back at my old dash you MIGHT fit two across the top and a Suzuki gauge and a VHF below. But you have almost nothing left for switches. Get some new wire lighted switches that are labeled on the switch and that'll save some room. Maybe in a straight line across the bottom

You are probably going to have to go vertical with the two units. What I mean is, the dash is angled, you need to build up a vertical flat space at the top(where the compass is) that will fit two 7" displays. Don't worry about blocking the windshield, nobody looks thru that anyways.