They all make undertrays/skid plates.
There are a couple here: http://www.rallysportdirect.com/Exterior
But yeah you'll likely need to chop anything that you get. I would definitely look into alternate piping. Do you have a top pic of the engine bay? I'm really curious.
I could have swore that Paranoid Fabrications made a subframe brace like the orange one above but just looked at their site and don't see it. Keep in mind if you do get a subframe brace, not all skid plates will work with them.