Cold weather preparation

[biscuits and gravy]

Do any if you guys run engine belly tarps?

I'm thinking of covering the bottom area of the engine to block the freezing temperatures when driving. In the past I've placed baby diapers around the fuel filters and taped them up there and they helped.

I want to go one step further if I can. I'm interested in how to make one on my own if it's possible. Or a suggestion on a reliable place to order one.