I built the reefer back in 1999 I think and at the time it really didn't bother me that it had multiple parts for the sides, roof and floor. But it just didn't look aesthetically correct for a US style reefer trailer. I have physically seen them whilst in the US and I have seen photos and it just doesn't do it for me now. I have my old one on the bench awaiting restoration including air ride suspension, repaint and better detailing to try and make it as close as possible to the real thing. If AMT can manufacture reefer and dry vans with one piece sides, floor and roof I'm sure Italeri could.
As for the Volvo, I think they are great and when built they look amazing. I have two that are almost complete. Not that I am complaining but Italeri should have made it so that it had a multipart frame, pose able front axle, and a detailed engine with a tilting hood and that would have made it an AWESOME kit in my opinion.