Thanks for the replies! Unfortunately it didn't resemble either of
those aircraft. I'm still curious. It was a very neat little
airplane--and looked factory-built rather than homebuilt. It was
aluminum with round-head (not flush) rivets. Lots of yellow warning
stickers in various places. The cowl was off but I did not a get a
good look at the engine. Should have walked up and looked at the
builder plate!

Patrick