Just a quick note following your ad on PPRUNE.
The man you need is Tony Melody.
He has been building and testing these for CAA, James Bond films and all sorts. He is doing displays all over the world these days. On top of this he is a thoroughly reasonable bloke! He will be more interested in helping get you sorted out properly than helping you unload your wallet.
Please give me your contact details and I will get him to contact you. He will give you some very sound advice. If he doesn't actually sell you one he will tell you what to ovoid and probably point you in the right direction.
Wyatt