Not sure if this is intentional, but the block Duel Crafting Table may be a misspelling. The intended word might be "Dual" Crafting Table.

Duel: a fight between two individuals
Dual: two things in tandem.

Not meaning to nit-pick, just making you aware!
Thanks so much for the great mod! learning and enjoying it, and wishing some of these things were in 1.7! :D