Like some other Land Rovers, it has a Chevy LS3 engine from a Camaro SS, but to keep it from being unbalanced, Kahn lengthened it by 15 inches to its current 105 (hence the name). Essentially, the entire body is rebuilt in-house, and comes with those 1980's-tastic box flares.
The best part, though, is that this is the first of many. A 6x6 variant is in the works, as well as armored versions. All that's missing is the ability to bring 'em into America.
Aaron Miller is the Rides editor for Supercompressor, and can be found on Twitter. He'd fly to England for the chance to drive the 6x6 version of this.