I have this lathe as well. (Love it by the way. Solid lathe for the $$)
I have never worked from the back side of it or pictured myself doing it, but I would still leave room on the back side of it. The reason is if you are doing a bowl you will want to yank off the tail stock and slide the head stock all the way to the far end of the lathe so you have easy access for hollowing. You might also want this for doing a bowl that is big enough that you can't do it over the bed. You will want to have enough room behind the lathe so when you stand at the end and hollow you have plenty of room to work on your right side with your longest hollowing tools. I put mine too close the first time and immedietly ran into problems with that and had to scootch it away from the wall a foot or two. A delight to do at 450lbs.
Also, I first tried a mobile stand that I had made (quite beefy) and I was not happy with the solidity. My initial thinking was that I had a small shop and it would be valuable to be able to shove this puppy around to create room. Instead I now have nearly everything else on wheels instead. Works find and actually created more space than if I had wheeled the lathe instead.
I took the lathe off the mobile stand and then took the time to position it well, then once I was happy with that I put 2x boards in the slots they provide and lay as many 60 lb bags of concrete on it as I could fit. Between that and carefully balancing the legs the stability is terrific now, I have enough room to work when hollowing from the end and all is great. Incidentally, if you do use bags of concrete (they were cheaper than bags of sand for me for some reason) You might buy a small roll of wrapping plastic or a truly waterproof tarp and wrap the bags so water from green turnings doesn't get to your bags and ruin them. I think between the weight of the lathe and the weight of the concrete I have about 1,000 lbs holding that puppy down. It is realllllllllly stable.
Hope you enjoy this lathe. I love mine so far and was very please with what I got for the $$.
Dave