Whatever you do concentrate on ducting or baffling the airflow so it flows THROUGH the cooling fins. Directing air in the general direction of the fins may not do the job. Baffles usually direct airflow so it is forced to go through the fins and not escape around them. The DLE35 with its rear mounted muffler is known to have issues with carb overheating in tight cowls so be sure there is some fresh airflow to the carb area. It doesn't take much but you'll know in a hurry if the carb is running too hot as the engine will be hard to adjust, it may run rough at times and it may be difficult to restart when hot. Some users fashion a heat shield plate that mounts to the firewall and extends forward between the muffler and carb. Then there are users who do nothing and their engines run perfectly with no special baffles, other cooling aids or precautions. Its still good to be aware there may be cooling problems and this is not just limited to a specific brand engine as all engines are happier when running within normal temp ranges.

You may want to do some searches for baffle ideas and cooling suggestions as there have been many other threads over the years.