I also do my own welding, plumbing, roofing and electrical work. 

@Tal Shachar also not sure if Menards is in your area or not but in addition to off the shelf Jen Weld windows which I've used many times https://www.menards.com/main/d...   

Needless to say I did not buy one as our temperature regularly gets down to -20.

Requirements, 10 x 20 bunker, "solid" door, water and humidity dry, temperature moderate or controlled.   

The steel would have to be welded, no getting around that. 

He told me he did it already, he opened up the wall, cut out the section with the dent, welded the new section in.

IG: @MattPriestJr I have properties that I rent by the room in King/Pierce/Snohomish Counties.Many pro tips.For heating, I use Nest Thermostat and "lock" the temperature on 68 degrees. 

Do you know what temperature the tenants have the heat at?

(REMEMBER THIS ALWAYS) You have greatness in you,(YOU ARE ALREADY CREATE LIKE THIS< WITH GREATNESS)  just like a seed. ( a seed) doesn't say I am just a seed, a seed has potential inside, it just needs the correct environment and timing and condition to become GREAT and ABLE to create fruit, It needs, Soil, Water, and correct temperature to grow (and time) .

My other suggestion would be going to trade school for welding, plumbing, electrician, etc and learning something that can help you add more value to your real estate portfolio.