If you make the plate same as table size you can rotate it 90 degree so it supports larger parts , while at the same time you can clamp them at the original table.

I meant some flat vice or like you say split vice/ i don't know the correct name


I wouldn't bother so much at the beginning until you figure what exactly you will be making . But you will definitely need a vice. The aluminum plate you can drill for specific jobs and when you figure what exactly you need , make a new shiny one.4

I dont know what happened to me last 2 years but i started hating universal stuff like vacuum tables and so, and started doing fixtures for each specific job. And am pretty happy.