DIY Desk - Trestle stability

Question

I am trying to build my desk.
I can see a lot of positive comments about the Karlby worktops from IKEA and I think the 2.46m x 0.63m walnut worktop is exactly what I need.

My problem is that I already have two trestles from Habitat, which are 60cm x 60cm. https://www.habitatthailand.com/en/p/trestle-60x60-made-of-oak
So the trestle will fit exactly in the corner. 
Is this a good practice for the stability of the desk ?

I am thinking about an extra leg in the middle (probably an Alex drawer).

Thank you for your suggestions

Rob Elliott · Answer

Stable, yes. Your base is the same footprint as the table top, it won't tip over.

However, I would be concerned about the strength of the Karlby worktop. From Ikea's website:

Table top/ Edge: Thick oak veneer, Oil-acrylic.
  Backside: Foil.
  Basematerial: Particleboard.

Particle board is not as strong as solid wood. It would probably hold a monitor and normal desk stuff, but I'd be worried about someone sitting on it. I would like to see support underneath. Typically you would combine a particleboard tabletop with an underframe, eg

BEKANT Underframe

DIY Desk - Trestle stability

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