Loft Conversion (Storage) - Beams Deep Enough?

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Hi everyone

Have a typical redrow type house (90's build).

Since removing the water tanks from the loft, I want to board it to use as storage (about 40sqm total brick to brick / 30sqm usable)

Details:
It's a duo/fink truss build.
The bottom chords are 95mm x 35mm, spaced about 55cm
The webs are 75mm x 35mm.

Doing the build is no problem, however I am unsure about whether the bottom chords are thick enough use, or whether I should place some decent sized beams across them?

I was considering telebeam (used in previous house), but decided it's above and beyond what's probably needed, and started to look at these wickes loft legs:


Or the LoftZone kit:


They look roughly the same (although the LoftZone has cross beams), is there much real difference between them on a day to day use?

Will use standard tongue and groove loft boards on each

Any comments appreciated on the beam depth!
 
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