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Those two curves would give you 5 inch track centers. Six is recommended for large equipment, so you may have to test and see if five will work with what you are going to be running. I do not know what the track centers for a set of 072 turnouts set back to back for a crossover. That might be a problem, hopefully someone can let you know that.
Use an O-82 curve section as easement on both ends of all corners. It looks and works better. Half curves are also your friend to make the corner finish at the right angle.
I use O-72 easements on my O-54 curves and it smooths them out a lot.
Then adjust the length of straight track in between corners to get 6" spacing center rail to center rail
Even with Realtrax you can get a bit of give in the joints to make an inch difference side to side as you go along over a few feet.
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