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I just did both of my 740 seat-backs yesterday, using basically the same procedure. The passenger seat had a crack all the way through the foam behind the left shoulder, and I did the driver's seat as a preventive measure. The only procedural difference is that I invested in a set of hog-ring pliers and a box of hog rings, which makes this job so much easier, especially on the 740 leather seats where there are 3 rows of hog rings behind the front cover of the seat and 1 behind the back cover (i.e. the rings that pull the seat cover tight to the cushion). I couldn't imagine trying to get my fat fingers in there to fasten zip ties.
In any case, it took me about 5 minutes to remove the seat, 15 minutes to remove the skin and headrest, 5 minutes to remove the springs, 15 minutes to apply the glue/foam stuff, 4 hours to let it dry, 15 minutes to apply tape and towel material to cover sharp edges on the seat frame, and then about 30 minutes total reassembly. I don't work particularly fast, either. Not including the time it takes the glue/foam stuff to dry, it probably took me about 1.5 hours per seat.
One other thing -- WEAR LATEX GLOVES when handling the foam. I used "Great Stuff" which is available at Home Depot. It is unbelievably sticky.
Also FYI (for 700/900) -- I've noticed that the foam used for cloth seats is different than the foam that is used in leather seats. In my experience, the foam in cloth seats tends to crack AND disintegrate, whereas the foam in leather seats justs cracks. Just look on the carpet under the seat for proof of this. One of the cloth seat-back foams in my other 740 could not be salvaged and I bought a leather seat from a salvage yard with which to rebuild it. To my complete disbelief, the leather seat-back foam is even a different shape! Where the cloth seat back has only one row carved in it to fasten to the seat cover, the leather seat back has three rows. AND to top it off none of the 3 leather rows are in the right place for the cloth cover to attach to. I ended up having to carve a new, 4th row into the leather seat back to make my cloth seat cover attach to it. I'm pleased with the result but it was more screwing around than I would have preferred.
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