I can't speak to the diesels too much, but we have a 1991 gasser that we're selling and I from what I've seen of the interiors, etc., in various ads over times I think the gas and diesel rigs were built to the same standards with regards to quality.
And in that respect, I have never had any complaints. It's a well-built unit with what appears to be good construction standards, etc. Ours has held up quite well. Much of the cabinetry is solid wood (not all, but the key parts like doors and framing). Nothing particularly "proprietary" in the coach -- which is good given that Rockwood's been gone for many years now. (Forest River bought the name but doesn't know anything about Rockwood the Class A).
I will say that a 1995 would have been built right at the end. And a detroit diesel is different from the diesel's I've seen which were 230hp ISB's on the Oshkosh chassis. Also, if you care, at least on the Oshkosh diesels, the holding tanks were somewhat small -- 28 gallons each for gray and black (compared to 38 each on the gas models).
I don't know if looking at pictures of mine would confirm/deny similiarities, but you are welcome to look at them at http://www.irv2.com/rvclassifieds/sh...hp?product=824
. My guess is that if it does look similar, then the materials, etc., probably are very similar. If our family wasn't expanding and my wife "requesting" something with slides, I wouldn't be considering selling mine as I've been very happy with it.