I have been playing around with the same. From what I can find out the hooks are Mosquito hooks, although I couldn't find any of these and got some Black Magic fly hooks which have a similar profile. Even tried the trailing hooks on a Jackall Chubby & caught a nice flathead. Have also got the trailing hooks attached to other lures but haven't had time to try them out yet. So far I have used 20KG braid, but would like to try a lighter braid as I think the hooks would swing a bit more freely.
The home made trailer hooks worked a treat last weekend on a ZX with plenty of undersized Bream, even had a double hookup a litle tailor on one hook with a little Bream on the other.