looking for keel/centerboard design
The Luger 28 was a very inexpensive, very poorly built kit boat. They sail very poorly by any objective standards. They were primarily designed to be the biggest boat that could be trailered. Back in the 1970''s there was one in the next slip to my boat. The owners were new sailors who had bought a partially completed Luger and finished it themselves. They were disappointed in the boat''s sailing ability and over a period of months I sailed with them quite a bit and tried to get the boat to sail better, changing rake and hardware positions etc. Installing new hardware I was not impressed with the glass work.
The Oday 28 is an alright boat. They were built in large numbers and are reasonably common. Some had OMC saildrives. I would avoid one of those. These are nice coastal cruisers but not boats that I would want to go offshore in.