Hard to improve on Baltic Birch. If even minimally braced, the stock enclosure with BB should outshine the original. One critical area to look at for improvement is the joinery (or lack thereof) where the top meets the bottom cabinet. A few dadoes or using a modern sealing material would improve on that quite a bit. Also, the original construction of the inset "kickboard" leaves a lot to be desired. There are more than a few ways to do that part differently.
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