New to Building

Good morning everyone,
I am new to building and I am planning a large Laser cut table. Right now I need this table to be 5 ft by 6 foot. The first question I have is on the linear rails can put multiple together? The largest I see is 1500 MM. What would I use to connect them.

Thanks everyone Many questions and comments to come as I get the parts to make this Laser Cut table.