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Nope, you don't wanna do that.
First, because it would require you to make the coop raised up pretty high, and that gets much harder to engineer to be stable in high winds.
Second, because it will considerably decrease your usable floorspace (it can't just be a popdoor-sized square opening, chickens cannot levitate, it will need to be large/long enough to allow an angled ascent)
And thirdly and most of all, because ALL THE BEDDING will constantly be being kicked out of the coop onto the ground, resulting in great waste of bedding and nasty conditions under the coop.
Really really, don't do it.
If you want to make cleanout easier, make a hatch in one wall that opens right down to floor level, the width of the space between studs, so you can shovel/pushbroom the bedding out onto a tarp (it will be too low for a wheelbarrow). Then leave it closed the rest of the time.
Good luck, have fun,
Pat