65" English Warbow
You'll not make a 100# English warbow with a 30" plus draw length from 65", unless it's a flatbow design, in which case it isn't an English Warbow....
Not that I'm worried by the definitions
You are better off starting with a 78" stave, you can always take an inch or two off, but starting with 65" is IMO doomed to failure.
Mind, if you can do it you'l get my vote for Bow of the Month!
Linen is ok, but much better to go with FF... forget Dacron, you'll never brace it!
Del