Question Any advise on boarding a loft in a TruSteel MK2 Bungalow?

Hi All,

 

I have been trying to find the article referenced on here a few times but all the links to it seem to be redirecting to the main page. 

We have recently bought a mk2 TruSteel bungalow that has additional insulation in the loft, and I would like to board at least a section of this. I have looked at the joists (steel joists) and they are 155mm high 60mm wide and 835mm apart (center to center).

 

To board this would I just build a frame out CLS timber? And would this need to be attached to the steel joists?