AWESOME!!!
I am making the twin core (or dual core) system myself, borrowing lots of ideas from here! Thank God I came across this thread as I was also thinking of other ways which have all been addressed here and the fact that the simplest method - SOLID PP as kostas calls it - is actually the most efficient, has made my day as I had already set out to do it this way
THANKS to you all, I will post updates with photos as I progress with my contraption