I'd be inclined to order a made-to-measure insert then build the framework myself. There are lots of online places who'll do that - I have this lot bookmarked from when I was based in the UK.
As an example, a 780mm x 550mm panel is just under £60 inc VAT, a 780 x 550 Velux window is just over £470.
There are almost certainly French companies who will do the same but I haven't looked for any since I've been here.
If you decide to order from a UK supplier I'm having to pop back every month or so at the moment so could bring it back from my UK address for you.
Bon chance!
B
As an example, a 780mm x 550mm panel is just under £60 inc VAT, a 780 x 550 Velux window is just over £470.
There are almost certainly French companies who will do the same but I haven't looked for any since I've been here.
If you decide to order from a UK supplier I'm having to pop back every month or so at the moment so could bring it back from my UK address for you.
Bon chance!
B