Indeed - Re-routing the popes and wires could be a major pain. Is the chimney still in use? Do you need a new heating system? if its in use and you vent your heating system through it and your heating system is on its last legs you could upgrade your heating to one that doesnt use the chymney. Then it could be removed. Yor water heater could also vent in the chymney. Could be for a firepalce too.
if you have good access below and reasonable access to where all those pipes and wires go to then it should not be too hard.
THIS ISNT A WEEKEND PROJECT.
There are a lot of things that would and could be impacted. Your kitchen will be a construction zone for a while. You may be cutting out plaster in all the locations where those pipes and wires go plus creating a new chase, or opening up a wall, somewhere else.
Make sure you know what you are getting into before you start tearing further into things.
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