Making rates of reaction micro kits

Hi all, has anyone made the micro rates of reaction equipment (Cleapss). I was wondering what you used to make the holes in the plastic. Do you have any tips for making them? Thank you
where is it on CLEAPSS? it sounds interesting.
i have made other microscale items for the electrolysis, and I used a soldeiring iron to burn the hole into the plastic. i have also used a hot nail to get the desired size of hole.