Mike,
Are you asking if a big bolt's front fenders can be easily attached to a 1/2 ton cab and the 1/2 ton cab's "front clips"?
What year truck is a 4800 (is that the correct size)?
What size truck are the fenders coming off of?
What size truck is the cab coming off of?
What size truck is the "front clips" coming off of (and, what parts are in the front clips - grill, apron, radiator frame and cover, and hood)?
I think that the standard cab was the same on all sizes of Advance-Design trucks (47-53, and 54/55). And, that you should be able to attach everything forward of the cab (as a set from the same size truck) to any size standard cab.
Someone will correct me or clarify this soon.