I've progressed with the front seat and for those that want to try their hand at a worn out seat I'll detail how I do it. Obviously, I should point out that my way is not the only way and you may well find a better method of getting the job done.
First, here are the main components for our worn out seat.

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What is pretty obvious is the huge hole in the seat.

This is to give the springs somewhere to pop out of. It's important to thin out the plastic around the hole to a very thin edge, after all the seat covering is not very thick so we should try to replicate that. The hole can be any shape that takes your fancy. The seat springs are attached to a small plastic frame to make it easy to place them under our seat. Finally, emboss the foil with the fabric pattern on the seat by pushing the foil onto the seat with your finger. The foil will end up being your seat cover so its important to make it look like it belongs. For convenience make several copies. Oh, and make sure you emboss the pattern onto the foil BEFORE you cut the hole out otherwise the pattern won't be over the whole seat.

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Normally I would just glue the foil to the seat with super glue and make the tears afterwards however it seems logical to see what different cuts would look like with this type of effect. After a few tries I came up with this. Its only foil so try as many variations as you like. Adding a small piece of sponge to represent the seat padding is the final step. Mine looks like this though I haven't glued it on yet.

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Don't worry about the rear edge sitting proud. The glue will snuggle it down nicely. That's the front seat base done, now for the seat uprights and then the back seat.
By the way, it's not so important to get it perfect if you are doing a car with a roof because it's not easy to see everything inside. However, if you are doing a convertible, like my 55 Bel Air, it's probably a good idea to take care with the finished product.

Good luck with your worn out seats guys and thanks for looking.
Vincent