We do a combination of a bit before ... and a bit afterwards. It is definitely much easier to lay out your footprint and to peg out the groundsheet by doing it first, but then you're stuck with the webbing straps that hold it square being above the groundsheet as a trip hazard.
So here's how I do it. Put up the main body of the tent first and loosely guy it on the four main corners to avoid it turning into a rather large kite!!! (Voice of experience here!!) Then run the groundsheet under one bedroom area, over the webbing straps and out the bedroom area on the other side. Lay the groundsheet exactly where you want it to be and peg it it down - the bedroom areas will still be flapping about so it is easy to get to the corners of the ground sheet.
I then jiggle the central area around a bit until I can peg the furthest four corners of the two bedroom areas just beyond the groundsheet. I jiggle the four poles of the central area a bit more to double check that the webbing straps are taut and that everything is 'comfortably' lined up and square. I then proceed to peg everything else into place.
I do admit that it takes a bit longer to do it this way, but it is far easier than crawling around into the inside corners trying to peg down the groundsheet. And I am always much happier with the quality of the pitching as I know everything is square.
We actually have the XXL Classic and a Rigipod Excelsior and pitch both in this way unless the weather conditions are such that we have to get inside in a big hurry! I am assuming that a similar system would work for yours.
Hope this helps!
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