I’ve had two TS3’s. One was fitted with a BMW thrust engine and from memory a15hp briggs up front, very noisy up front. There should be some noise test videos of it on you tube. Search highland hovercraft. From memory noise was around 100db
My second TS3 had either a briggs 35 or kholer 40 for thrust and another briggs around 17 to 20 hp for lift. Again pretty noisy also there should be a video of me ploughing it at around 26 mph. Admittedly probably my fault, as the lift rpm was only about 2700 at the time. I was playing around to see how it performed at different rpms. Joe Milligan in Ireland bought that craft and as far as I know, hasn’t had any plough in issues
My biggest bug bear with this type of craft is the noise up front, but decent headphones sorts that and lack of usable storage space for spares, tools and spare fuel, but again with some thought, something could be sorted
I seem to remember when the coastal pro was launched a few years ago Flying fish worked closely with a guy that done a lot of noise experiments on hovercraft to try and reduce fan noise.. I've have forgotten his name, but I think he has recently developed an electric hovercraft. I think the coastal pro's are in the region of £40,000 new, so £10,000 isn't going to be to far off market value.
The Flying Fish & British Hovercraft hovers tend to be more popular in the Hovercraft of great Britain hovercraft club, so maybe a good idea to also ask on there. Someone will probably know this particular hover