If you had a TIG welder you could drill out all the holes wider in the added on chassis, use the same stock screws and just tack weld the second chassis to the main chassis. I did think of doing that but there is more than one way to skin a cat. This here is awesome ....I never thought to just make the one frame just a strip down the center.....That's a great idea. Also....you just added a nice skid plate that can be changed out later. Thanks for posting this.......This is well done.
Your rear A-Arm mud flaps are well done also....I like how they bend around the edge.