Problem is - its a 3 season tent.
I figure if i get a couple (or triple) of those reflective foam
mats, PLUS sleeping bags.. shd be ok right...I layer like SIAO lah.
PLUS the foot print - u think can insulate from ground chill or
not?
how adverse is your winter?? got snow or not?
Heng the squirrels didn't keep them.
that was autumn camping up in the canadian shield country
....... I don't think anyone's mad enough to camp in deep winter
over there, other than the inuits and the local army ... 
in the day it was still just hoodie and pants weather, but at
night I really suffered ...
but I think it should be fine lah ... I'm envious of your tent
... I can only afford MSR's stoves ... 
get a balaclava though, else your face'd get frozen ....