1. I havent done the parcel shelf yet as not sure what i want to do with speaker setup. Door trimmings.. you need to pull the originals iff and he supplies you with material.. it's a simple arts & craft day of outlining the piece and cutting it out.. i then used a glue (can't member which one) and glued it on, tucked the edges in and waited for it to set.. both the parcel shelf and door trims is just supplied in material and you cut to fit (at least thats how he was doing it when i bought mine)
2. leatherette and reborn leather is the same product as he's the same guy i bought from.. he was called Symrna Import Export when i bought mine.. his name is Max Ungun and he's on other forums with username maxfromaus. he once called his material leatherette and yeah it's not 100% like leather
3. i never took my factory covering off.. instead i plan to go to a autotrimmer or something similar that can sow the edges into the seat seamlessly and i will just remove if i wish to return to factory
4. he actually has factory seats and he has removed the covering and uses them for his cutting measurements, so your seats will be the same size as factory (lines and all)