Removing that dent is going to be difficult. If it were a body panel on a car, you'd be able to get behind it and tap it back out with a hammer and dolly but I don't know that you'd have enough room to get a hammer in there. If the metal were smooth, like on an early 1205, you could possibly just fill it with Bondo but the textured finish will be challenging. If it were mine, I'd just leave it be and accept the dent as a 'battle scar', emblematic of the use that it has seen.
