BAD MECHANICS - Thermostat and Radiator Fan Blade

...and a GOOD shop can do it in less than 15 minutes.

I think 15 minutes is a little optimistic. Describe the steps that would need to be taken to do the complete repair in under 15 minutes. Are you planning on re-using the radiator inlet? Does this include pressure testing after the repair? I have done repairs similar to this before. The way I would do it is something like this...
1. Start the stopwatch. Determine the new position of the inlet. If the new position overlaps the old position it would matter how I approach the repair.
2. determine if there is enough length left in the old tube to be reused after it is cut off flush at the top of the weld attaching it to the radiator. If not you need a new inlet tube. Grinding the weld of the old tube is going to be outside the 15 minute time frame.
3. If the positions don't overlap. I would cut the old tube off with a saw and grind the weld flush. Then cut a rectangle or square patch that covers hole and grind marks and lays on top of the tank. This will be easier to weld and look pretty. Don't weld yet.
3A. If the positions do overlap or if you would like the way this repair looks better, then cut a rectangular patch to cover the whole area including just past where the tube goes. Spot patch in place.
4. Cut new hole for tube with holesaw.
5. Clean welding table off ( because there is always something laying on the welding table when you need to use it) Clean and prep for welding. Set welder up, grind tungsten if needed lay out filler rod and clean helmet lens.
6. Spot in patch ( if not already done) and tube then weld.
7. After it cools. Pressure test.
8. Click the stopwatch. Should be around 14 minutes and 55 seconds. lol