ken werner
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I think your first design with biscuits would work just fine. Bear in mind that the edge of plywood is 1/2 face grain, which makes a much stronger joint than end grain. Adding in the strength of the biscuits, and IMO your cabinet will withstand anything you put in it.
FWW did a test some years ago comparing biscuits and M&T joints. You can search their index. The M&Ts were stronger, but the biscuits did well. I respectfully disagree with those who think that biscuits are for alignment only. They add little to the strength of say - an edge joint in a table top [because a well executed edge joint is stronger than the wood by itself], but for joinery, they clearly add significant strength and durability.
I'd say go with your original design, if it suits you.
FWW did a test some years ago comparing biscuits and M&T joints. You can search their index. The M&Ts were stronger, but the biscuits did well. I respectfully disagree with those who think that biscuits are for alignment only. They add little to the strength of say - an edge joint in a table top [because a well executed edge joint is stronger than the wood by itself], but for joinery, they clearly add significant strength and durability.
I'd say go with your original design, if it suits you.