We have done it before with good results but there are a few codes to get around.
I don't think you can just have it drop straight down into the P Trap. I believe it needs to roll into a horizontal line then the p trap. This slows the speed of the water down so the P trap doesn't empty with the rush of water.
With out the P Trap under the sink snaking can be a problem if the Vent and clean out are not near by and accessible.
I'm sure your plumber can bring you up with the code requirements. If you have to go this route make sure you keep your pipe size as large as possible to give you the most options for lay out and P Trap placement.
This is for my personal home, (complete remodel) the plumber that is doing the work quickly said no. Its not the end of the world either way, but I like to try and think outside the box. On that note It still needs to function and meet code. I just don't like the "can't be done attitude" It kind of almost seems lazy to me. I think it would look awesome to not see any of the drain or supply lines.
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