The first part of the build (well second - I'll come back to the Sierra in another post) is to build the chassis. This requires that you have a large flat surface (about 8' by 4') that's completely flat and level. Onto this, you draw your plan and you're off.
Here's my building board which is basicaly 18mm MDF glued and screwed to two 3 by 2 lengths. You'll see that I've laid out the basic metal piece and secured them with white fixing blocks (available from most DIY places) to stop them moving about.
The book by Chris includes measurements for all of the steel box section you need. To make life easier, there are 2 or 3 suppliers who supply ready cut steel packs where the box section has been cut and mitred according to the book. I took this approach and bought mine from a company called Armoto where a very helpful chap called Jason can supply them at a very reasonable price.
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