I did that. I knew the measurements of the stand so I thought I could build the sump for it with no probs. Well it didn't fit. So I cut out some holes in a wall for plumbing and put it in a different room. Good for me but not so Happy wife though. oooppsss. Anyhow good luck with your project and if you can do it use 1/2 inch and sleep better at night.
Cheers