The only tent that I have that does not have a built in vestibule is the Lighthouse, and that is precisely what I don't like about it.
The poncho over the Contrail was something that I put together originally as a sun shade, it was close to 40c , about 5c less under the extended vestibule.(not that it is a particularly good idea to have silnylon out in the sun for prolonged periods) . It overlaps the Contrail by a few inches , you can see the front guyline of the Contrail about 1/3rd under the poncho....
I have had that set up under moderate but prolonged rain. If you want to make it a bit more wind worthy just drop the height of the front pole. If a strong wind blows in that direction , you have a kite.
If you happen to have a mate with another Contrail or similar A front tent, you can then join the two and have enough room in the middle for eating and playing cards.