This should give you the basic details, looks to be basically a custom boat only 6 made so I doubt you will find much info, and since they were made in the early 70's perhaps they are all still with older owners that don't put there entire life on line?
SCHEEL 45 sailboat specifications and details on sailboatdata.com
This was in the notes, so perhaps you might find more luck with finding info on the Morgans.
Six Scheel 45's were designed and built by Henry Scheel in Rockland, Maine. In later years this design was built by Morgan Yachts as the Morgan 461 and 462.
I would not be surprised if this one did not have better quality interior than the Morgans. I would not expect much performance with that shallow draft and S/A of 12.21. Looks like a nice motor sailor though, as it sure looks comfortable inside!
Looking at the layout on sailboat data, I wonder if it was not meant for the charter trade? With the bunks in the aft cabin, it looks like it was trying to fit in as many berths as they could.
If you are looking at the one in Rockport check out the hours on that motor, impressive, but I can't imagine it has much life left. 8732 hours! (I know they can go on for almost ever)