Another poll, huh? XJ - what have you started???
My answer to 2): 5 1/2 months for the oven, start to finish, many pauses for weather and concrete curing to the point it could be polished. You could probably do the oven in a 6 - 8 weeks or less with good weather, good logistics, and eight hours a day. There's some built in pauses for concrete curing where you can't do a thing.
3) I'm in stall mode on the kitchen. Fixed income, taxes coming, BBQ to buy- I'm hangin' loose for another month till I re-evaluate finances.