Its word-of-mouth reputation has seen it score deals from Somerset to Manchester, but now staff have unveiled the results of a contract much closer to home – a series of Hollywood-style computer-generated images of the last remaining Second World War submarine in Britain.

The project is part of a bid to help Gosport Submarine Museum raise around £6m over two years to help spruce up and repair HMS Alliance, the museum's top attraction.

In a bid to inspire people to donate, Design Image has produced realistic three-dimensional pictures of the vessel and the planned work to the museum.

The firm is the product of husband-and-wife duo Adrian and Michelle Notter.

Adrian, a director, said: 'The idea was to produce a brochure which we could circulate to businesses in the area, and a smaller one for visitors. But there's always been the view that the CGI we've worked on will be made into very large panels, creating a kind of mini-exhibition if you like, and showing a bit about the history and why the restoration work is important.'

It opened in August 2005 and quickly grew the business, trebling the turnover of the business in the first year, and now doubling the 2007 figure.

Although the most recent contract is significant for the firm, Adrian said there was a sentimental reason behind it as well.

He said: 'The whole contract was something we wanted to do anyway. We're a Portsmouth-based firm, and I grew up here. I believe very strongly in it, and I've a personal interest to do the best job we can for them.

'I used to go with my father when I was small, and I'd take my kids when they were younger. It's a really hands-on museum.'