Is that an extruded channel you are using for the rail?
I'm not sure to understand what you mean...
That is very interesting, I haven't seen it done that way before.
It looks like it makes it pretty simple to align the rails w/ the core.
Have you tried this technique before and if so how does it hold up? How thick is the channel wall? It looks quite a bit thinner than the solid abs rails I have seen other guys use.
French shapers often do like this (ABS or PVC), it works very well. I do like this on my 2 boards customs and will do again like this on the next i'm shaping right now.
PVC is 6x4mm, but i use now 10*5, it's easier to glue on thr PVC foam and the surface with resin is larger that is better for adherence.
On the subject of wrapped rails, by "several shots" you really mean "two"
Yes, at least two... if you put tips with 'thrust' you may need to have 3 shots