Plywood? I'm not so sure. I know that fastening two pieces of 1" solid wood will be stronger than a 2x4, but plywood? If your friend is an experienced woodworker then I would trust him, but somehow that rings an odd bell to me.
I suppose it also depends on wood types. I always build stands using solid 2x4 or 2x6 fir. I always thought plywood was kind of a 'happy mix' of different woods (much like the 2x4 you can get at HD and Rona - SPF: spruce? pine? fir?).
Of course, if the tank isn't holding up more than a few hundred pounds, I wouldn't worry. If you need a good fright, look at any prefab stand in a LFS. They're built almost shockingly flimsily, yet how often do you hear about one of those stands collapsing?
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