REXHALL Aerbus Water Pump Replacement

I have a 1995 Rexhall Aerbus XL3300 with a 460 engine.
The water pump is leaking, and I am getting opposing info on how drastic the changeout is.

2 Mechanics say the whole front area towrd the bumber, must be removed ... 2 day job.
Two say it should be replaceable though the doghouse removal.

Has anyone here had that same experience with that same unit?

Thanks ... Richard