The bonnet (hood) is custom made.
as far as getting your designs made up in fibreglass your lookin at hell of alot of gelt
as they have to do everything from scratch there's alot of work involved in making such a thing
you could maybe try and see if there is a company willing to make you up your design for you at vastly reduced rate in exchange that they keep the design and take a mould of it and mass produce them for the aftermarket
but this would be very hard to do and alot of work involved as they would want to see sufficient demand for the kit etc...
try approaching some local fiberglassers who have experience in this field
or better still an aftermarket kit manufacturer
Good luck mate.
p.s. what i did was buy some cheap copy erbuni style kit and a a bumper etc from a scrap yard took them to a specialist company who do custom bodywork
and asket them to make a quality well fitting kit from it and then they could sell more versions on if later
so they moulded the various bit to the bumper cut and shaped, fiberglasses, and rubbed everything down when it was finished they took a mould of the whole bumper and then when the mould was ready all they did was pour fiberglass in it and .... voila the new bumper with kit as i wanted in one whole seamless piece >

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