How to make a dining table base with a tube holder in the middle of the base with bolt and nut connection?

I used asquare tube size 8cm x 8cm the height of the table base is 78cm (its height can be adjusted by about two centimeters) and the width of the base is 100cm and the length of the base is 190 cm.

You can make this base model in any dimension and any size for a dining table or kitchen table or center table or computer table or work table or coffee table.