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Wire type pushrods are fine until they get over a certain length then they can flex and bend out of shape when under compression, causing at best not very positive controls and at worst complete loss of control. Here's a simple and cheap way of stiffening them up.

Derek's fuselage folding method uses a router to 'V' out the correx so that it will fold nicely no matter what direction the flutes are running, it's possible that someone else has used this idea or similar before, but as Derek has no internet access and came up with the idea completely out of his own head, here we will call it his.

Can I use commercially available control horns ?

Yes you can, but it can cause problems, Correx is not as rigid as balsa, and it gets more flexible/weaker over time. Normal commercially available control horns have quite a small footprint on the control surface, this is fine for balsa as it is fairly rigid and can quite easily cope with the load placed on it in this small area.

What type of 'Downpipe' should I use ?

You will have read about Canadian and American Downpipe or Downspout on most of the original SPAD Plans and also on the forums. Square Down pipe in the UK is available from most DIY shops (B&Q, Wickes etc) and builders merchants, it is all good enough to use for fuselages, after all its just to hold all the bits of your plane together, the main difference's between brands are weight, size and, flexibility.

What is a 'Yardstick' and how big is it ?

A Yard stick is basically a wooden ruler a yard long (feel free to correct me on this), They do exist in the UK but aren't very common. Their main use is for wing spars, and sometimes re-enforce correx fuselages etc. They are given away free in some of the larger stores in the U.S. and in the true spad tradition that's why they were adopted for use as wing spars.