The Hotchkis design seems to be a great compromise for a bolt on/weld on system.
You bolt it in the rear opposite the from leaf spring mount (4 bolts) and then you can bring it to your local muffler shop and have them weld the front up.
That being said, I bought the Auto Rust Technician SFCs. I had to slit the floors for them, can't tell they are there under the carpet, and welded them in myself with my 110V wire feed. Was a good weekend project.