Yep I have 200 hp. Previous owner re built the engine himself with the help of an engineer and then borrowed Mermaids test bed for four hours. I have the Mermaid certificate showing 198 hp at 2600 revs. Only just got the rib so Wavehumper (Stu) and I have only been out in her once. She topped 35 mph which is about 30 knots, at 2500 revs with four ppl on board. Think she will go another knot but didn't want to thrash her, thats not what she is for.
Doing the Mermaid Owners Club one day maint cse on the 30th Nov so will ask them what is involved. Details of the club on the web site. £15 per years seems reasonable for a 24 hour helpline especially as she is about to have a new console built and installed and there is a lot of wires to disconnect.
Halmatic are quite helpful even though I didn't buy it off them.
For tubes try Eurocraft in Leyland, Henshaws want £3k which is the going rate but still expensive. Mine has been replaced with 1200 gsm tubes probably henshaws by the look.
What are you using two Pacifics for? no wonder I couldn't find a nice one to buy for ages, you and Fill Smiff have got them all