I’m thinking about adding 2 additional aluminum tubes to the bottom wood plates and two additional aluminum 1x1" square aluminum tubes to the top X axis to stiffen up the whole assembly since I will be about 60" long for a 48" wide cutting width.
They add about 5 lbs weight and will only cost me $10 since I have tons of it.
I will just make the wood piece wider and drill in a couple of holes.
For the top I will stick tube nuts in the two round stainless tubes and put a piece of aluminum bar there.
It might look kind of wierd and if any hold down clamps are above the cutting surface too much they might get hit, but I think it should work.