No that porch will need to be built just like any other living space which means a foundation and proper framing, insulation wiring etc it is an addition

not if you want it to be a 4 season kitchen. sure, you can put a table and some cabinets there but it wont winterize the space. no tile should be put in there if it freezes in winter.

That's a tear down and rebuild. Add 50K to your average 60K average kitchen redo budget. If its that cheap.