1.5" strips of ply won't add much rigidness. It will still flex. More like a 2.5 to 3" piece.
I was thinking by laminating the 'ribs' between two sheets of 1/2" it would help make it much more rigid.
I like metric, too. I use it on all the boats and motorcycles I work on ... even the American ones.
But when it gets into the larger numbers, I have a hard time "computing" metric.
1000mm in a meter. 1000m in 1km.
Im an electrician by trade, but like working with metal and wood as hobby, and makes a few bucks too.
But I almost exclusively work with metric prints, but when I do get imperial I wonder how things get built with any accuracy. I can hardly get guys that can add whole numbers correctly, I'd hate to see them with fractions. Lol.
You Canucks and your blasted commie commie metric system...
Now, I have to point it out now, but that was a joke. Anyway, on the table issue, you could get some added stiffness with strips of solid wood glued on the bottom, ive done it more than once. I wouldnt use plywood strips through, plywood flexes a little more than solid. It's pretty handy to remember that stiffness goes up exponentially with thickness, so even a little added thickness can result in a much more rigid piece
Trudeau is a commie, lol.
Would even a softwood as the ribs help then?
My thinking was the plywood on the bottom too would make it like an I beam.