I'll have to check that, although it seems a grey area. In the iva manual, if i remember right it just says brake pipes must be securely clipped at regular intervals. (which my pipes are). Although if there's a specific spec, then i'll need to add more.
I thought the book spacing was just as a guide.
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My Build Diary -
http://davesroadster.blogspot.com/
*updated 7/6/11*
Best bit so far: Getting it running
Worst bit so far: Cutting steel for wishbones and engine mounts.
Most annoying bit so far: Generator packing up half way through welding.