I have a (I believe it's called) "W" frame loft:
(sorry about the quality of the pictures - maybe I should ask in the photography Stack Exchange how to take such pictures)
There are no floorboards, just ceiling joists, but I had an idea that I could create some additional storage by lashing some lengths of chipboard between the frames (making an upside-down A on the two arms of the W).
My question is: could this affect either the structural integrity or the airflow in the loft; or, generally, are there any reasons this should not be done? Further, if there are no reasons to not do it, then are there any considerations to bear in mind (for example, it occurred to me that I shouldn't screw anything in place to allow the beams to expand and contract).
Following a request in the comments for more detail, I have (badly) sketched what I'm trying to achieve. This illustrates the loft / attic space currently:
And this illustrates what I'm contemplating doing: