I have a solid top welding/fab table 3’ X 4’. Decided that a more modern approach would be nice for hold down and options. Got these off of eBay, they are CNC laser cut and are impressive.
https://www.ebay.com/itm/CertiFlat-FB4848-4X4-FabBlock-DIY-Modular-Welding-Table-Top-Kit-Heavy-Duty/332319077263?hash=item4d5fc2b38f:g:stoAAOSwjyxZd5O X
I also got a leg kit as well, the entire package came shipped on a pallet, delivered to my shop door. While my price was 25% cheaper, the cost of steel has skyrocketed. The Chinese went to the rustbelt and bought all our sidelined steel manufacturing equipment and went into business.
My steel supplier said that almost every future ton of scrap steel in the US is owned by the Chinese iron industry.
They are experiencing the same growing pains that we went through in the early 1900s.
I like the holes because there are tons of different hold down options. My solid table requires using the edges and “c” clamps, severely limiting clamping possibilities.
Check out the Magtab series of magnetic hold down fixtures.
Weldmonger on YouTube has amazing series of videos, no shortage of subjects to nerd out on;
https://www.youtube.com/user/weldingtipsandtricks
https://youtu.be/VMkfNHZaIWg
If you are Warren Buffett:
http://siegmundtables.com