Alpkit were initailly quite insistant that this vent cover had the same sort of stiffening that a jacket hood has and that it was fully maleable back into shape. This is clearly not the case, and they are wrong to say so. I have tried very gentle heat and I have tried molding it over a shape (suitably supported large flower pot!!) for an extended period both without success.
If you look at the picture of the Solist on their website, the tent that is show is clearly straight off the production line as it is beautifully smooth, and the vent cover is a nice section of a circle - pack that into a bag and send it throught the post and neither of those is retained. I can live without the beautifully smooth but the distorted vent cover just looks awful. To have had two tents in which that cover is badly distorted after packing shows that there is a problem somewhere.
I could try greater warmth, but I am not getting any guidance from Alpkit that that is going to help and the headache is what is that going to do to the DWR, and if too much heat the tent material itself.
My feeling is that the designer saw this door wide vent cover as a nice visual effect and also an easier build in that it is sown into the 2 front corner seams of the flysheet. The downside is that because it is ~500mm long it has to be supported by stiffening over that whole length, and as that is not maleable, it is prone to taking a set when the tent is packed and rolled up. The irony is that the actual vent itself is only 150mm wide so has no need for this lengthy cover.
It does have to be said that this is purely visual and if you are prepared to live with it, then go for this tent. Unfortunately I am retired Quality Manager so such acceptance is not in my bag.