How to build a bench seat for a dining table?

[J-P]

Hi There -

I am building a bench seat for my dining table and bought these legs - https://www.bunnings.com.au/rapidhome-30-x-45-x-6cm-black-la-paz-steel-tube-bench-seat-furniture-leg...

I need some help on what panel to choose. It would have to sit 3 adults (max case) - So about 250 - 300 Kg. Do i need to consider some sort of reinforcement for the panel. I also will stain it to match my dining table colour. Any suggestions would help.

Thanks

[Dave-1]

Morning @J-P 

Bonus stuff is GOLD! its like finding an extra chocolate in teh bottom of a bag

Dave