Homemade Metal Ladder for Furnace

The access to my house furnace is on a wall above stairs and not easy to access. It takes a ladder to get into the area and I have always used an A-frame style ladder. It was time to make a ladder that attaches to the wall to keep from lugging the A-frame ladder in and out of the house. I had the square tubing and angle iron so why not weld one up.