Carpet Question

Generally it will regain shape. Suggest laying in carpet as intended. Put weight on corners, joints. Then expose area to a heat lamp. Since you'll probably do one side at time, when comes to doing the other side, leave the weights on the first side. Find another set for the second side.

Remember it's not set in stone until you start poking holes in the carpet for seat belts, shifter boot, high beam switch, etc.