Hi
The stand I got with my mill is very well made far better than the stand that came with my lathe, its got adjustable feet so leveling up was a dodle, you end up with a very stable set up, I'm very pleased with it.
If you go with a self build aim for something that is as equally robust and you will have a very nice machine, I'm very happy with mine, I will be fitting a DRO and a power feed in a few months and will post a thread.
Have fun
Stew