Redoing seats, removing the factory covers to get at the innards intimidates most otherwise mechanically very competent DIY'ers. I'm not sure why.
Good job jumping in and tackling it like a boss!
To anyone else thinking about recovering their seats, removing and repairing UV eaten foam is nothing more than cut out the bad, splice in new foam of a similar density, shape, glue in place w/3M upholstery glue. Doesn't' have to be perfect or even sorta good, fair is fine inthis case, the cover smooths out 1/4" steps and transistions and you never even see them.
Once you own a pair of hogring pliers (available from Eastwood) replacing original style seat covers just is reverse order of your careful removal, and takes a little patience. A little trick is to turn the new covers inside out and put them in the clothes dryer for 10 min to remove wrinkles, and most importantly softens up the vinyl which makes it pliable and easy to work with.
1995 E350 7.3 Diesel, 4x4 high roof camper, UJOR 4" lift