Ok, this isn't a post about what kind of tent I would need for winter camping.

Most on the forum know that at this time, I'm unemployed, and can't afford a
new tent for winter camping so I have to make due with what I have.
What I have is a 2 season tent, that I'm going to try to use this winter.

I have a budget of about $0.00, but I have a couple of heavy duty tarps.
Right now, I'm thinking of putting one tarp under the tent, and using the other
as a kind of fly for the tent. Both tarps are big enough to do this.
As well, I have foam pads, and two of those air mattress type of pads for inside
the tent so I won't be sleeping directly on the floor of the tent.

My tent is a small hexagonal type dome tent. I have a rain fly, but don't
think it will help much.

The camping is going to be car camping so I don't have to worry about packing
the tent and tarps too far.

The question is what else would I do to winterize the tent?
Would I pack snow up against the side of the tent to help insulate it?
The tent stands only a couple of feet high, and is about 6 or 7 feet on
each of the six sides.

I also have a roll of 6 mil poly that I used for a vapor barrier when I
re-insulated my ceiling this summer. That could be used as well.

Any suggestions from the seasoned winter campers as to how I could set a camp
up for maximum warmth given the assets that I have?

Oh, camping conditions would be 3-4 feet of snow, fairly sheltered camping
area, temperatures in the 0F to -25F range.

Thanks
Cheers