I want to offer the readers I used in the method of the door trim: it is simple, inexpensive, convenient and allows you to achieve a good zvono and heat insulation front door. And without removing it from its hinges, which is important, especially if work is carried out in winter conditions. First I affixed to the door of glued newspaper sheets: noting in this paper the flag the perimeter of the door, got the pattern of the door, leaving the allowances at the edges of 15 — 20 mm. Glued this pattern (sometimes) I have had the sheet of foam (with bone glue). Instead of foam you could take an old cotton quilt, pre-quilted burlap or other insulation deadener. Protruding beyond the edge of the pattern pieces of foam (not sure it should be a full list — possible and connected of separate pieces) cut.
Then spread on the floor a roll of pre-prepared artificial leather (leatherette), and put it on the underside of the foam (paper side down), occasionally glued it to this future upholstery. The edges of the leather bent at the foam billets and stitching with strong thread. Instead of leatherette with success could be used and leatherette. But, of course, the use of foam and leatherette contributed to the aesthetics of the upholstery.