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Have you done it on SK08 or above top hung sizes? Because I wonder if that effects anything (due to weight)?
chrisbmx116-
The windows are supported by the joists and trimmers. A bit of plasterboard isn't going to be affected by the size or weight of the window.
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not sure which model I fitted?? but done several over the years and and none have cracked. I've not specified any on a project this i me installing them myself to my own properties. As below the windows aren't structural
leggy_blonde
pryally
I've done that detail on all my windows (arch tech) and I believe it is recommended by Velux to aid air flow. The channel top and bottom is angled on one side to accept the palsterboard at an angle.