I'm a huge fan of Jolicraft, but I think it would be difficult to make into an FTB pack. First, 16x packs are difficult in general, since you can't rely on added detail/realism to make a design distinct - it has to be symbolic, and it has to stick to the style set out in the original modpack.
That brings me to the second issue. Jolicraft isn't about realism - it's about style, and Jolicraft's style isn't easy to sum up in a guide and extrapolate from - it's got a sense of whimsy about it. I feel like the only person I'd trust to make Jolicraft mod support that feels right is Andre himself. He might not need to work on all of it, but (1) I'd want an idea of how he prefers to handle machines/pipes/cables, and (2) I'd want him to tackle the major/fundamental aspects of the game best suited to his characterization (Extrabiomes, Thaumcraft, and Twilight Forest to start).
I haven't known him to collaborate on anything or do anything related to mod support so far, but I wouldn't completely rule it out, either. Anyone want to try to get him interested in FTB?