Probably the best thing to do is try it out. Do what JDW did first: remove unnecessary components (the hard drive is the only thing that comes to mind), but leave the fan on and see if hot air comes out. If so, that's a bad sign.
Next step, stick some sort of electronic thermometer into the case and monitor the temperature. Do this with and without the fan, clearly monitoring it more closely with the fan removed. If there's a substantial difference, that's a bad sign.
There is some sort of metal shield on the bottom of the mainboard. Removing that may improve air circulation from the lower vents, using convection cooling just like in the Plus. It may work, because I'm guessing that the vent for the fan on an SE will constrict the airflow less than the top-mount vents on the Plus.
Also consider the temperature in your house. The rate at which heat is dissipated through conduction depends upon the temperature difference between the inside of the case and the outside of the case. Convection will depend also depend upon that temperature difference.
Next step, stick some sort of electronic thermometer into the case and monitor the temperature. Do this with and without the fan, clearly monitoring it more closely with the fan removed. If there's a substantial difference, that's a bad sign.
There is some sort of metal shield on the bottom of the mainboard. Removing that may improve air circulation from the lower vents, using convection cooling just like in the Plus. It may work, because I'm guessing that the vent for the fan on an SE will constrict the airflow less than the top-mount vents on the Plus.
Also consider the temperature in your house. The rate at which heat is dissipated through conduction depends upon the temperature difference between the inside of the case and the outside of the case. Convection will depend also depend upon that temperature difference.