Power comes from a Tuthill-fettled 4.0-litre flat six, which will produce more than 500bhp in standard, naturally aspirated form and more than 600bhp with an optional turbo package.
Both engine variants are available with either a manual gearbox or a seven-speed dual-clutch automatic one.
Tuthill said it took inspiration from the 11,000rpm 911K 3.1-litre engine that it has used previously in restomods but hasn’t quoted a redline for this larger engine yet.
Just 22 examples will be built, each requiring some 3500 hours of “meticulous construction”. Tuthill hasn’t quoted a price.
Company boss Richard Tuthill said: “It has been an absolute pleasure to work with this amazing bunch of people at [our base in] Wardington, who continue to have such passion to create these amazing cars.
“At the heart of this piece of artwork is of course the constant pursuit of mechanical excellence.
“We have taken inspiration from all that we have done in the past and have been inspired by what others have done before us and continue to do.
“As usual, I sincerely hope those who wish to own one of these will also wish to drive them as often as they can and create memories that will last a lifetime.
“The FIA GT1 class enabled manufacturers to create stunning race cars. We have taken the best bits but focused on producing a wonderful road car. I hope you can all enjoy it with us.”