You'll have to either get a manifold flange made with tubes on it to match up to the ITB's, or you'll have to cut up an existing GSR manifold and modify it to work, fun either way..
Since I'm replying to this thread anyway, I have some CBR1100XX throttle bodies I want to sell if anyone is interested in them for one of these projects, let me know via email firstname.lastname@example.org
Locash Racing 94 Integra, 84mm B18C, Precision 7285, 8 ID1000's, Motec M400 8.90@170
Locash CNC 01 Integra, 84mm B18C, Precision 72mm. 8 ID2000's - Motec M800 8.21@183
Locash Racing, Dynapack Dyno Tuning & CNC Machining/Product Development