One of the big differences in Ping Pong tables is if the edges have another board on them that goes down a bit. This reduces warping a lot.
Good luck
That is called banding. The nicest tables have steel banding. For the average person, it is major overkill though.
I thought about building my own,except for a few details:
1. ping pong table is 5'x 9', so each half of the table would be 5'x4.5'. Particle board is 4'x8'.
2. Room is a premium, and I like the fold up mechanism of commercial tables.
3. The laminate alone required for the table top would have cost more than the Walmart ping pong table.