didn't know the Irish insurers prohibit replica insurance for drivers under 30 years of age (assume that's what you mean). I'm in Ireland and insured my 355 replica with Axa and now the Extreme F360 (I'm 52). I originally insured the 355 rep with a kitcar insurer (under a motortrader policy, take a look on the IKCC Irish kitcar club website and forum for more details). Axa classic (Kitcar and replica) cover me know, there's a guy there that take care of it.
Your car looks nice. I'd say €5-€15k value, depending on the condition of the donor etc. Some of the 355 reps I've seen have not been looked after or fnished properly, the ads say great things, but many need work, which is the bottom end of the spectrum.