Bottman, I think you get something wrong here.... no boat is it worth to invest tons of cash for a boat show. Thats sh**** pimping up an old boat for "show making" ? - Do you want attract "old sailors" with "old boats" ??? - Young people are interested in foiling multihulls, and not in an old "Verbatim-Bullfrog"
The boat shall sail as a cruising-trimaran, thats her destination now.... and not hanging around on the peer with tons of visitors to evoke "good old memories". Thats lots of noise and bla, bla, bla... For what is that good ? Boat design and construction methods have developed over last 20 years.... young people cannot be attraced with such a "historical monumentum".
Take a good example with Trimaran Spirit, an ex Formula 40 Racer from U.K. ! - Claudia (from Italy) and Jason Gard (the owner) took more than one year of hard work from 2014-2015 to refit this ex-formula 40 racer... and now its going smoothly as cruising-racing boat....
The refit and its ugly, durty and expensive work over nearby 1 1/2 year is documented here: http://trimaranspirit.blogspot.com
I suppose one must take 120-150 Thousand dollars in hand for a complete refit of a 40 foot Trimaran to bring up the ressources for a very modern update (inclusive electronics and safety equipment + modern electric system).
If you dont have the money, forget it.... then better you overhand the boat to a NGO/Foundation, do crowdfunding (by a professionally fund rising marketing) and have the hope herewith, that one day there is enough money together to let her sail again as we know. I seriously have my doubts, that this concept can work (saying this as ex consultant for strategic marketing).
No sponsor will invest anymore in his campaigns into such an old boat, better do it with a Diam24, Pulse 600 or an Airplay Raw 30 and others... whatever new racing Tris are out there nowadays in that size to sail easily > 20 knots. Why a sponsor should as there are enough excellent refitted Orma 60s and Mod 70th out there one can get at low prize of max. 150-300 Thousand Euros with the guarantee, to have good media coverage (thats all what counts at the day for a sponsor: media coverage, reaching the target group + image for the brand).
In my understanding it needs a private owner with passion for smaller Trimarans who earns his 300-500 Thousand per year as income, so he can pay easily the refit. Everything else is a real illusions.
I say this very critically... I had been professionally skipper in the 90th... and all boats I had to take care for "private owners" who didnt have the will to invest what the boat needs ruined it. I have seen too many beauties rottening nowadays as there is not enough financially liquidity. That's urgent...
...and not begging Prime ministers for money (such countries and others need money more urgently for helping the poor and kids for good education and health care).
Best you overhand the boat to somebody who has the skills, or at least the money to pay the skills of a professionally refit. The boat deserves it to come under sails again, and not pretending to be a beauty on the pier of inwater boat shows !