I was allowed to synth it, though it blew up and I lost two velvet cloths (not too bad a loss for the sake of study).
This means that the subcraft cap on this synth is at MOST 27 - because if it was 28 or higher I would not be allowed to synth it (not allowed to synth recipies over 15 skill points higher than your skill). Considering that Ram Leather caps at 36, this is interesting. It also means that, if it really is about 27, breaking HQ2 on the sub is possible.
Just thought I'd help out by posting this. I'll let you know if I get any more info on this synth.
My idea on the whole subskill thing is that the item that is being subbed i.e. Ram leather which I don't know the cap of off hand, will be the cap of the subskill that is needed.