I'm putting together a desktop for my pc working space and I'm on a tight budget. I ordered a particle board kitchen counter top, 38 mm thick (1.496"), which also will be laminated with HPL. The dimensions are 140 x 80 cm (55.118" x 31.496"). I'll be putting it together with 4 independent legs at the corners (no frame here). I'll put an LCD monitor on top of the desk with a new "wooden" raising stand under it (but a 2nd monitor might show up in some time) + additional accessories (keyboard, small speakers, a lamp, pen baskets etc.) + resting my forearms (at least half of them) on the top.
Now, do i have to reinforce it, so the middle won't sag or bend? People whom i ordered the top from told me it's thick enough and it shouldn't bend, but if it happens slightly in 2-3 years i should add a 5th leg in the middle. If i need to reinforce, how do i go about it? Should i screw some sort of a flat metal panel on the bottom to follow the long edge? An aluminum profile? Or maybe a wooden board would be enough? Wouldn't the metal reinforcement add to the overall weight?