koffer brothers in glen burnie. i think they do alot of fab work. i know im gonna get my longtubes done by them. they're on crain hwy. i am not sure if i spelled it right. but there are tons of race cars in and out of there constantly. hope that helps.
Autofab Race Cars is about as good as you can get in MD. Mark Constantine has been doing high end race chassis for years and he is also the guy who set up Evan Smiths (Muscle Mustang Fast Fords) Stocker Cobra. He is a bit pricey but you will not be dissapointed. He is in Elkridge on Washington Blvd. You can also check out his website at www.autofabracecars.com.