Here is a website with photos of a '96 with the floorplan you describe:
http://members.aol.com/airstm2268/excella.htm
We actually have the floorplan you picture in our '85 Sovereign 25'. When I first saw it, I was dismayed - no way did I want that stupid corner bed. But I figured I could construct someting else when time permitted.
As we used it, we found that this floorplan gave us both an extra wardrobe and a vanity/dresser AND ourside storage on the streetside! There is no way we would give that up just to gain a walk around bed. Besides, the vanity is great for laying out clothes of a night. Or watching TV.
I thought we would hate the crawl-over-your-partner bed. It has simply not been an issue. I believe we had ours made at 52", so it is a little narrow if you are used to a queen. We sleep on a standard full size at home, so the difference means nothing to us.
One change we have from the pictured floorplan is that a PO removed the small vanity shelf along the back wall for more footroom. We chose not to replace it as it is juuuust barely possible to step back into that corner to make up the bed.
As noted, there are plenty of sources for custom mattresses (there was a thread on this just last week, I think - search the archives). I ended up tearing out the existing (sliding tambour) vanity and built one with four drawers plus a small corner storage area with a hinged door.
With four and a half overhead bins (1/2 of one is taken up by the electric switch box), three large bins under the bed, four large drawers and storage area in the dresser/vanity, and one large and one medium size wardrobes, we literally have storage for fulltiming. Not that I'd want to in a 25'.
This a very rare floorplan. I have only heard of two others.
Pitty the photos area is down or you could see my photos.
Mark