Well let's see getting back to your suggestions....
Houses would have been (ideally) refridgerators and hotels would have been cars.
Now, about the DOB and the FFBC...I was actually thinking of turning this idea into whoever puts these games out so using the DOB and the FFBC would be strange to put it nicely. I mean every Opoly game as references that most everyone knows. Most people know a good portion of the PGs and elements to show. Maybe a good portion would know who Roger is...but only us would know about the FFBC. I don't know maybe I can come up with a special GR.net version.
The Tax spaces...Income Tax was Prize Tax and Luxury Tax...I believe it was another "Buy TPiR Souvenir" space. I couldn't think of any other good tax ideas.
Oh..I remembered some more Chance/CC cards:
You don't know how to play Check Game??? Go directly to Jail!
You sent the mountain climber over the cliff. Go directly to Jail!
Get ready to punch the punchboard! You punched out..$100! Collect $100!