In the final stages of building this TV stand. Sides are dovetailed 1" solid walnut, and vertical dividers are 5/8" walnut plywood set in 3/8" dados. 2 drawers on each side. my question is will i have any concern with sagging overtime if the span between the legs is 48" from their outer edges? I might be overthinking this, cause it feels pretty sturdy. Should I add a fifth leg while I still have the wood to match, or is it overkill with a cabinet like this?