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Nice, another P3D User/Creator.
I highly recommend this Tutorial from Bill Womack -

It's a Tutorial Series but there are 3 Videos about Ground Polys which are fantastic - that's how i do my Ground Polys.
I have that series bookmarked. I had already watched and was thinking he left out the final step of how to convert to a format that the flight simulator could use (so it wasn't giving away the whole process for free), but maybe I was mistaken. I had a lot on my plate anyways since I was in the process of learning how to do everything else. Thanks!
Converting would be done with MCX - i personally export my GroundPoly as an .mdl file and then use this file with MCX (GP Wizard)