Contact Lee at Fusion for price of fabrication.
It is not worth me getting involved in the odd one as there isn't nothing in it for me really.
I supplied all the parts like a jigsaw puzzle to fussion and he expertly welded them up for me.
Parts sourced from Jenvey, webcon etc. Plenum, throttle mounting plate etc machined and made up by me.
Design of manifold is dependent on your application, due to space in the engine bay, no. of injectors, throttle body etc etc.
With fuel rails injectors, throttle body, Reg etc etc mine is looking at the best part of £1400