Why the whole egg? Are the shells nutritious?
Egg shells contain some calcium, my dog doesn't like the shells and will leave them, but she does like the eggs. I just give her the ones I've bought for us as in the UK the hens are tested for salmonella so our eggs are pretty safe.

Raw chicken bones - not cooked?
All bones being fed to the dog should be raw. When bones are cooked they can take on a honeycombed like structure inside, most bird bones have large air cavities or are made of a sponge like structure, I know chickens don't fly well but thats retained and thats how they can splinter as opposed to being ground down by the dog.

Tripe - how about cooked tripe? I know you meant raw in the blurb.
Tripe smells when it's raw, well the 'green' tripe does and thats what you'd be getting from the slaughterhouse. If you cooked the tripe it'd smell even more and so would the house.

Could i mix the complete with the chicken mince?
If you were weaning the dog over from one food to another then yes you'd mix the new food into the old food like normal. I've never weaned a dog or cat onto raw, they've just been changed over. They've not suffered any problems with their digestive system when I've done this but some dogs might.

Do you make the chicken mince or can you buy it?
If your butcher has said he'll mince stuff for you then he'll probably mince the chicken for you, or you could buy yourself a hand mincer and do it yourself but it would take a long time and you'd have a sore arm from turning the handle.

Will most butchers have a stock of waste meats they sell off dor peanuts and is it anygood? Anything to avoid?
Most butchers will have a scraps box, there will be the paddywack, gristle, any bone dusted edges (if they've had to saw through a bone the dust sticks to the meat), meat from just around the neck area (from beef) there will also be quite a lot of pure fat in their scraps box as well. Things to avoid - obviously meat that is turning (just starting to go off), pork apparently should be avoided (this is because when worming procedured weren't as good as they are now tape worms eggs could be found in pork legs afaik), small vertabrae bones as a dog could choke on these.

Would a chicken quarter be too much for a JRT?
That would depend on how big the quarter was and how much the dog weighs.

If I'm wrong on anything I'm sure someone will point it out, but thats just off the top of my head without looking through anything.