My biggest recommendation for PCTPE would be to make sure it is DRY. A drybox as you plan will “keep it dry”, but it won’t remove existing moisture.
I have 3 spools of PCTPE, two from Amazon and one directly from Taulman. All were extremely wet when they arrived, despite being vacuum packed with a desiccant pack.
Here’s what it looks like when it has moisture (as all 3 spools did when I received them). Bubbling, popping, oozing caused by the moisture makes printing virtually impossible.
http://youtu.be/LqqRnooxCT8
Here’s what that same filament looks like after baking the entire spool at ~65C for about 12 hours:
http://youtu.be/s-I6nb3yLQw
So… When you get your spool, extrude a bit into air as in the videos above. If you see bubbling/popping or a lot of oozing, then you will want to put the spool into a 65C oven for 12-18 hours before trying to print anything with it. Then store and feed it from a drybox to prevent it from becoming contaminated again.
As long as it is dry, PCTPE is FANTASTIC. Prints well, works with standard extruder (flexistruder not required), and is unbelievably durable. I made some pulley sheaves, put one on a concrete floor and hit it HARD with a hammer over and over. It still looks perfect, no damage whatsoever, the hammer just bounced off of it!