Hummer specialist Mil-Spec has revealed several H1 builds over the past few years. One of the its most recent creations was a $300K version of the H1, which featured a Kevlar-embedded finish and the company’s standard engine: a 6.6L V8 diesel that can grunt out 1,000 pound-feet of torque. Mil-Spec introduced it last summer.

The newest rebuilt Hummer from the company is the M1-R H1, a $412K custom build by commission. The customer wanted to forgo the stealthy and fundamental black of previous offerings, and elected a rebuilt Hummer dressed in bright yellow paint. The big diesel engine remains a constant. New features and components include six-piston brakes.

Something of a torch-carrier for the original Hummer spirit, the Michigan-based tuning and restoration-modification company doesn’t generally ornament or embellish beyond utilitarian treats of one kind or another. Exceptions include Nappa leather upholstery and a high-end audio system. In this case the interior has been transformed to all-business, including trim machined from aluminum billets.