sorry looking broom capricorn

[alfmech]

i have recently aquired a shabby looking 'fishing' boat that i have been informed was in a former life a broom capricorn speed boat, having stripped the very ugly looking cuddy from her it is now clear there should be a very nice looking boat beneath all the filth and bodges,
i am searching for information on how the original capricorn should have looked and been laid out so i can hopefully return it to something very similar.
and will obviously be in dire need of some period fittings I.E screen and surrounds
she is approx 18ft long so not the smaller version i have found through google, and only has a 4cyl volvo penta aq131 engine with sterndrive (that actually runs!) sort of

if anyone has any useful information i would be very greatful
many thanks
alf