That rig would be epic, but super expensive, I'm sure.
As a mechanic, I feel obliged to warn you away from the extraction method. There's no reliable way of telling if you've gotten all of the oil out (other than comparing what you extracted with what the manufacturer recommends you put in, but that's not exactly a sure thing as people tend to overfill and underfill, and recommendations aren't always exact). I'd say somewhere between 85-90% of cars have oil filters located near the bottom of the motor, you have to go down there anyways, might as well just do a conventional drain. I agree with Matt's idea, a wide drain pan would suit your needs. Besides, once you get used to changing oil all the time, you won't make a mess anyways. And if you do make a mess... well, there's always cat litter.
As far as the lube service idea goes (yeah yeah, not what this thread is about

) ... I like the idea, I just don't see how feasible it is. Basic tools alone are going to set you back a bit, between varying sockets, torx and hex bits for splash guards/skid plates, wrenches and sockets for varying drain plug sizes, and the re-emergence of cartridges instead of using spin-ons and the sockets and adapters for those. Add on top of that the raw cost for filters and oil, not to mention needing different weights, brands, and types of oil. It will get expensive, quick. I'm sure you've done your research, but a simple oil change isn't what it used to be. If you go for it, though, I wish you luck-- Like I said, I think it's a great idea, if anything, it's an awesome convenience for your customers.
Feel free to PM me with any tech questions, I'm a suspension tech, but I still do my fair share of oil changes.