I have a honey-do that involves removing an old gas oven from a wall
cabinet and a cooktop from a counter, and installing an integrated
range. The wall cabinet will be turned into a pantry, and the
countertops will be eventually replaced, so a gap in the countertop
isn't a major concern.

Can I just remove the oven? I'm guessing there's a ball valve on the
gas tap; just shut the valve, unscrew the (I'm assuming) corrugated
brass/bronze pipe and haul away. Right?

When removing the cooktop and making room, should I just cut the
cabinet at the appropriate width and cut a piece of plywood to fit on
the new end of the cabinet? Also, same gas line issues apply, right?

Anything else I should watch out for?

-Phil Crow