You say : "two recent projects", but only talk about Meridian, what is the second one ?
Well you can find online the instructions you need depending on the camera you have to modify, here for exemple :http://www.lifepixel.com/tutorials/infrared-diy-tutorials
and I ordered the proper filter here : http://www.kolarivision.com/diyIRfilter.html
have fun !
I've tested IR filtering with an old GH1 I customized myself :https://vimeo.com/76813235
It's a very interesting process, but it's mostly BW imagery. I tried several things with color images but they're way too off, and it's almost impossible to get the skin tones back.
And depending on the "array" of the IR nanometers you pick with your filter you can get very different results (I had a 730 if I remember correctly, unfortunately this camera was stolen from me...) but I didn't had such soft and transparent skins as they have on this one !