@shiloh it was me!! I guess we both are guilty of loving big chuckster kitties.
I just went to the local craft store and bought some flat balsa wood slats like THIS
I then cut them and lay them across the carboard 'beams" length-wise and then put the top scratch pad on top of the new balsa wood slats. I can take a pic of it tonight.
That, combined with a bit of extra packing tape on the corners has made it quite strong. Don’t get me wrong, it wont last forever, but the cardboard is surprisingly sturdy to hold by big chonker boy.
I’ll also add that the taco truck will get parked in temporary storage since I picked up the new Christmas Locomotive! choo choo - all aboard for Holiday cheer!
good luck!