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Dave,
I've had a look at your blog. You have standard 'gang-nailed' roof trusses. These are designed to take the weight of your roof but to use the minimum amount of timber in so doing, to keep costs low. As Doug says, do not attempt to alter these without professional advice - to do otherwise could result in the roof collapsing!
The diagonal timbers which are visible in your pictures are there for two reasons:
(i) they hold the trusses correctly spaced while the roof is being constructed;
(ii) they then help the roof resist wind forces once it is built, and thus they are known as 'wind braces', I understand. As with the trusses, they should not be tampered with without advice.
Regards,
John Webb
 
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