I thought this was a cool idea, so when I decided I needed an anti-dew system too after too many nights with a blow-dryer in my hands, I started my own DIY anti-dew construction project.
As for me it is mandatory that every knob and connector is placed as perfect as possible, I started by making a template of the lower part of the fork where the controller fits in.
While doing so, I thought maybe other members of this forum might be interested in having the template too, so this is the reason for this post. It took me a while to make this template as good as possible, so I'll save you some time by offering mine.
Attached you'll find a pdf with 2 pages: one "blank" template, that can be used at will: just add the necessary knobs and holes for your own project. (import it into a graphical application or print it out as blank and draw on it)
The second page is the template I actually used for my project, with all the holes I wanted to make, just as an example.
If you print the template out on an A4 self-adhesive label, you can attach it to the part of the fork in question and have a protective sheet against scratches during the machining process and very precise indication where you need to drill your holes at the same time.
Drill/machine right through the template and remove the label when done...
If you happen to run into problems while printing the PDF or importing in another graphical application, I can offer it also as a MS office Powerpoint 2007 file (.pptx), where you should be able to edit it and print it with the correct dimensions. Just let me know.