They look awesome are they just connected to something like a boggbros inlet manifold by some silicone hose ? what bike bodies work best and with what management ?
Those haven't been pared up to anything yet but the intent would be exactly that.
As mentioned GSXR600 throttles work well. They're well sized, (38mm), for most power requirements and the cylinder spacing is as close as you get to the CG engine without having to go too mad on a convoluted manifold. GSXR throttlebodies from larger engines e.g. GSXR750 are a bit big in my opinion, (42mm), and may hamper tractability/response somewhat.
Jenveys run with a very big throttle, (42mm-45mm taperbore), but they have an exceptionally good system taper, so will take a larger body naturally with the butterfly closer towards the bellmouth, (see pic below).
Management wise, any ECU that is capable of mapping Alpha-N, such as Omex 600, DTA S40, Emerald K6, Megasquirt etc.